False Confidence
Some people are loud about how good they are. They don't want feedback. They're not interested in criticism. They're defending something. That's not confidence. That's insecurity with volume.
Real Confidence
Real confidence is: I know I'm not perfect. I know I have blind spots. I'm not afraid to look at them. In fact, I actively want to. Because I'd rather see my flaws than live with them.
That person can take feedback without flinching. Not because nothing hurts. But because they're secure enough to care more about getting better than about being right.
Building It
You don't build confidence by avoiding criticism. You build it by hearing criticism, sitting with it, and being able to say: yeah, that's true. And then you change. Each time you do that, you become more confident, not less. Because you know you can handle the truth.
That's the kind of confidence that lasts.