I dunno. . . It'd be nice to think that we actually *can* get rid of that negative crap that buzzes around inside, but I'm not convinced. I think some people just manage to live with it a little better than others, camouflage it behind a convincing show of self-confidence, or maybe just push it deeper inside. . . for a while. Never having been able to cope well with those sorts of feelings myself, I can only empathize and sympathize with your frustration.

For the record, and for what it's worth, you hide your insecurities well.