There's a saying "Be yourself. Everyone else is taken." You can't change the past so you can only learn from it. I sense that you're not fully ok with who you

There's a saying "Be yourself. Everyone else is taken." You can't change the past so you can only learn from it. I sense that you're not fully ok with who you are yourself and where you come from, and that leads you to the fallacious conclusion that you're somehow not good enough. The question is, what is your identity built on? Is it things that are internal to you and which don't depend on other people's opinions, or is it things that are external to you, leaving you wide open to judge yourself?