B, I feel the exact same way. Not only do I switch between those two frames of mind, but I, too, have friends who are, for the most part, smarter and better at everything I consider myself pretty good at. The thing to remember is that there is always someone better, no matter how good you are. For everyone better than you, there's someone else better than them, and on and on. There is no best, there is only better. That's just how it works, I suppose.

Though it doesn't make it any less depressing.