confidence

It seems to me that I lack confidence. And I'm not referring to not being able to do something because I don't think I can. I'm more referring to not believing in anything I do or say. If I'm doing a task that actually matters, I'll always be freaking that I'm doing it all wrong and I don't know it. I don't really think I'm incompetent. I guess its if I feel confident, I worry that I'm being too confident, i.e., cocky. Hubris, pride comes before a fall and all that. So I worry that things will go wrong just for thinking they'll go right. I must have read too many greek tragedies or something. Its really inane.