Like a lot of others have already said, we're all better at at least one thing than our peers.

Look at me, I'm a terrible outfielder in baseball, but I'm the only kid who can handle pitchers and is dumb enough to get behind the plate.

Likewise, we all are naturally inclined to think we're better than everyone at something. If we were just mediocre at everything, what the hell kind of confidence would we have in ourselves?