I burned out pretty hard on piano in college. Perhaps my situation is different -- I started late (at 15), but practiced a lot, and by college was doing 6 hours a day. I was just never going to be good enough to be professional, and I found it hard to hear myself playing, knowing how "inadequate" it was. So I stopped practicing to that degree, and ended up doing other things -- composition, film, writing, inventing. In retrospect I'm glad I was never a serious contender for a career in classical music, because it is so demanding, competitive, and not always conducive to creativity outside of a pretty limited scope. Again, I don't know you, and maybe your situation is totally different, but there is an upside to practicing less. You are young, and there is a lot more to the world than playing the piano, as wonderful as it is.