Confidence is one of the most misunderstood personal development concepts. It is often treated as a personality trait — something you either have or do not — or as a result of external validation, of other people's approval. In my experience, both framings are incomplete. Confidence is a skill, and it can be developed with practice, even by people who have spent their whole lives feeling fundamentally uncertain of themselves.
The most useful definition I know: confidence is the belief that you can handle what shows up. Not that you will handle everything perfectly, or that nothing difficult will happen, but that you have the resources — internal and external — to respond to whatever comes. This is a more durable kind of confidence than the kind that depends on everything going well.
Confidence Is Built Through Evidence
The most reliable way to build confidence in something is to do it repeatedly and observe that you can. This sounds simple, but its implications are important. If you are not confident in your ability to, say, have difficult conversations, the way to build that confidence is not to read books about it (though that can help). The way to build it is to have difficult conversations, survive them, and notice that you did. The evidence accumulates.
This is why confidence can feel so elusive for people who have been in challenging circumstances for a long time: when the circumstances do not provide opportunities to build evidence of competence, the confidence does not grow. The way out is the same in both directions: small wins, accumulated over time, that constitute a body of evidence that you are capable.
The Inner Critic
Almost everyone has an inner critic — a voice that, especially in moments of uncertainty or vulnerability, delivers messages about your inadequacy, your likely failure, your fundamental limitation. The inner critic is not the enemy. It is usually a protection mechanism that has become excessive. Its job is to keep you safe by keeping you small.
The work is not to eliminate the inner critic — that is not realistic — but to develop a different relationship with it. When the inner critic says "you are going to fail," a confident response is not "no I am not." It is "maybe I will, maybe I will not, and either way I will handle it." This is the belief in your own capacity that confidence actually is.