The older I get, the more I realize that in most cases it's best to be in the middle of the bell curve.

That's not to say there's anything wrong with having the single-minded focus required to be one of the best in the world at something. But you have to accept that you'll miss out on other enjoyable aspects of life while you pursue your goal, and know if and when you should move on from it, or you'll wind up very unhappy.