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You prepared for days. You know the material inside and out. But as the meeting approaches, that familiar whisper starts: Am I really qualified to present this? What if they ask something I don't know? Maybe I should let someone else take the lead.
Meanwhile, your male colleague—who prepared significantly less and knows objectively less about the topic—volunteers enthusiastically without a trace of hesitation.
This isn't a coincidence. It's the confidence gap, and it's been documented across industries, educational levels, and age groups. Understanding why it happens is the first step to dismantling its hold on your career.
The confidence gap isn't about your actual abilities. It's about how you perceive them—and more importantly, how you act on that perception.
Researchers Katty Kay and Claire Shipman, in their landmark book "The Confidence Code," found that success correlates more closely with confidence than with competence—particularly for women.
But here's where it gets interesting: The gap isn't about ability. Studies consistently show that women's self-assessments are more accurate than men's. The problem is that men overestimate their abilities by about 30%, while women underestimate theirs by about 20-30%. The result? A massive perception gap that has real career consequences.
Research from Cornell University's Ernesto Reuben studied this phenomenon in a controlled environment. Participants were asked to perform a math task, assess their performance, and then compete for a leadership role. Women systematically underestimated their performance, even when they performed equally well or better than men. And crucially, they were less likely to put themselves forward for the leadership position.

The impact compounds over time. If you're not applying for promotions you're qualified for, not speaking up when you have valuable insights, not negotiating your worth, or not pursuing opportunities outside your comfort zone—the confidence gap directly limits your career trajectory.
Understanding the confidence gap requires looking at how girls and boys are socialized differently from early childhood.
Research from Stanford shows that by age five, girls begin to doubt their intellectual abilities compared to boys—even when they're performing equally well academically. This isn't biological. It's learned.
Girls receive different feedback than boys. When girls succeed, adults often attribute it to hard work or being "good." When boys succeed, it's attributed to natural talent or intelligence. Conversely, when girls struggle, it's sometimes seen as evidence of lack of ability. For boys, struggle is framed as temporary or circumstantial.
This pattern creates different beliefs about competence. Boys learn that ability is innate and they possess it. Girls learn that success requires perfect execution and hard work—and even then, they're not sure if they "really" have what it takes.
Add to this the socialization around likeability. Research from Harvard and Wharton found that while assertiveness and confidence are rewarded in men, the same behaviors in women can trigger backlash. This creates a double bind: Be confident and risk being seen as aggressive, or be modest and risk being overlooked.
These patterns don't disappear in adulthood. They show up in every conference room, every salary negotiation, and every opportunity to self-promote.
Perfectionism is the confidence gap's closest ally. And women are significantly more likely than men to fall into its trap.
Here's how it works: If you believe you need to be perfect to be valuable, you'll hesitate to take on challenges where perfection isn't guaranteed. You'll overprepare for things you're already qualified to do. You'll downplay your accomplishments because they don't feel "good enough." And you'll interpret normal mistakes as evidence of inadequacy rather than part of the learning process.
Research from the American Psychological Association shows that socially prescribed perfectionism—believing others expect you to be perfect—has increased significantly, particularly for women. This type of perfectionism is directly linked to anxiety, depression, and career hesitation.
The irony? Perfectionism doesn't lead to better outcomes. Studies show that perfectionists are less likely to take strategic risks, less resilient when facing setbacks, and more likely to experience burnout. The pursuit of perfect becomes the enemy of good—and of growth.
One of the most insidious aspects of the confidence gap is how it warps your perception of evidence.
When you accomplish something, your brain might attribute it to luck, timing, or other people's help. When you fail at something, your brain sees it as proof of your inadequacy. This is called the attribution bias, and research shows women apply it more harshly to themselves than men do.
Meanwhile, the opposite happens for men on average. Success is attributed to skill and ability. Failure is attributed to external circumstances. This asymmetry creates a cycle: Men build confidence from their successes while discounting their failures. Women do the opposite.
Add to this the confirmation bias—your brain's tendency to notice evidence that confirms what you already believe. If you believe you're not qualified, you'll notice every mistake and overlook every success. You'll remember the one question you couldn't answer and forget the fifteen you nailed.
Impostor syndrome is the confidence gap's psychological manifestation. It's the persistent belief that you're a fraud despite evidence of success, and that you'll eventually be "found out."
Research from the International Journal of Behavioral Science shows that up to 70% of people experience impostor syndrome at some point, but women experience it more frequently and more intensely, particularly in male-dominated fields or leadership positions.
Now for the practical part. Research identifies specific interventions that work to close the confidence gap. These aren't about positive thinking—they're about changing behaviors and thought patterns that hold you back.
Your self-talk shapes your confidence. When you catch yourself thinking "I'm not qualified" or "I'm out of my depth," pause and reframe.
Ask: What would I tell a friend in this situation? What evidence do I have that contradicts this thought? Am I holding myself to a different standard than I hold others?
Research from Dr. Kristin Neff on self-compassion shows that treating yourself with the same kindness you'd extend to others increases resilience and reduces anxiety—without reducing standards or motivation.
Try this: Keep a thought log for one week. Note instances of self-doubt. Then write an alternative, evidence-based thought. This practice builds awareness and creates new mental pathways.
Your brain's negativity bias means you'll naturally remember failures more vividly than successes. Counteract this by keeping a "wins folder."
Every time you receive positive feedback, complete a project successfully, solve a problem, or demonstrate a skill, document it. Include emails, project outcomes, metrics that improved because of your work, and skills you've developed.
Review this folder before high-stakes situations, performance reviews, or when self-doubt shows up. You're not manufacturing evidence—you're correcting your brain's distorted view with facts.
Perfectionism is the enemy of action. Research from Stanford shows that "satisficing"—aiming for good enough rather than perfect—actually leads to better long-term outcomes and higher satisfaction.
Before starting a task, define what "good enough" looks like. Not what's perfect, exceptional, or award-winning—what's actually required and appropriate for the situation.
This isn't about lowering standards. It's about distinguishing between the 5% of situations that genuinely require your absolute best and the 95% where good enough is not only acceptable but strategically smarter.
Confidence doesn't create action—action creates confidence. Every time you do something outside your comfort zone, you send your brain evidence that you can handle uncertainty.

Research from social psychology shows that "behavioral activation"—taking action despite feelings—is more effective for building confidence than waiting until you feel ready. Because you'll never feel 100% ready.
Start with micro-doses of courage. Speak up once in your next meeting, even if your voice shakes. Apply for one stretch opportunity. Send one pitch email. Small, regular actions compound into genuine confidence faster than occasional bold leaps.
Confidence isn't a personality trait. It's a set of learned behaviors. Study people who appear confident and notice what they actually do:
You're not copying their personality—you're adopting their behaviors. Research shows that practicing confident behaviors leads to feeling more confident over time.
Here's a radical thought: Your tendency to accurately assess your abilities isn't a flaw. Your awareness of what you don't know isn't inadequacy. Your high standards aren't the problem.
The research shows that women's self-assessments are more accurate than men's overconfidence. What if instead of trying to match men's unfounded confidence, you leveraged your accuracy while removing the hesitation that holds you back?
You can be accurate about what you know and don't know while still moving forward. You can acknowledge uncertainty while still taking action. You can set high standards while accepting that perfection is impossible.
The goal isn't to become overconfident. It's to act with the same boldness that your actual abilities warrant.
The confidence gap isn't just about individual women feeling bad about themselves. It has systemic consequences.
When qualified women don't pursue leadership roles, organizations lose diverse perspectives in decision-making. When women don't negotiate their worth, the gender pay gap persists. When women's voices are absent from important conversations, solutions are incomplete.
Your confidence—or lack of it—doesn't just affect you. It affects what problems get solved, whose perspectives are heard, and who gets to shape the future of your industry.
The confidence gap is real, well-documented, and has significant career consequences. But it's not fixed or inevitable.
You don't need to become someone you're not. You don't need to match the often-unfounded confidence of your male colleagues. You just need to recognize when your self-assessment is more critical than accurate, and act accordingly.
Your abilities are probably greater than you think. Your qualifications are probably sufficient for most opportunities you're considering. Your voice probably adds value that no one else can provide exactly as you can.
The confidence gap asks you to question your worth. The research suggests you should question the gap instead.