Loomis' "Figure Drawing for All It's Worth," sort of a bible to some artists, ends on this comment that ideally you copy off and admire different artists but quietly, to yourself, say "yeah but I like how *I* do things."
and I think that's basically self worth; the world's full of people who are better than you in every conceivable way and somehow you've got to go yeah but none of them are ME, I do ME better than anyone else could.
Great in theory, hard to actually believe, though.