The point is, find whatever it is that motivates you and chase it.
"You have every reason to be," Mom said, "but you also have every reason to do this for you. You're the reason you're here." Renowned composers and musicians' names were etched in the practice room's wood paneling. I played many of their pieces, listened to hundreds of concerts, and now I sat in the very halls where some of them studied. That could be me, I thought.
Opportunities meet you halfway. You need to work toward them so you're ready for whatever they ask of you. Jobs, promotions, college acceptances don't happen for no reason; they happen because you're qualified and proved yourself up to that point.
I can't be mad at myself for not doing one passion of mine when I'm doing something in the other, especially when the two cross-over. If you find yourself in a similar situation, remind yourself that you're still doing it, and you can always change focus again when the time and calling require it.
What is it you want out of life? Forty years from now or next week? As I write this, I want a bacon cheeseburger and to perform on a resident Second City stage someday. Both are possible -- one clearly easier to attain.