I have less interest in those who think they are crap.

I think this is common but many try to roll with the idea of "sympathy sex"

Everyone should think they are the best deep down. Rationally you know you are not, but emotionally it allows you to have something to offer. Others are attracted to it. I think.

I think at least in some aspects, we have to at least entertain the idea that we are okay at something rather than consistently having a self-defeating attitude.

Confidence is attractive, as is skill to back it up.