How do you know of you're actually capable and not just manic? I've been worried about being too full of myself, and arrogant, and over confident. At the same time I also struggle with low self esteem, I flip between the two which makes this even harder. I'm so tired of not being able to trust my perception of myself. I want to be a good person and have friends but you can't really do that if you're too full of yourself.