A lot of us don't turn out to be professional musicians, writers or athletes. In between family and work, you start to realize how much these people put in to be at the top of their game. Time and effort you can't really put in if you didn't make the jump and have other life commitments.
I guess that's why a lot of people grow old wondering what life would have been if they would have followed through on whatever talent they appeared to possess in youth.