It is undoubtedly more difficult to support yourself with a music degree than a "practical" degree. Not to say that solely majoring in music is foolish, but there is no need to paint over the truth. I'm double majoring in physics and music, and I'm fully prepared to work my butt off. Since the year just started, I have an hour or so to bum around and post on the piano forum, but I'm sure once my classes get rolling, I won't have a scrap of time for this (during the week, at least).
If you're still in high school (if you're not in high school yet, you might change your mind about piano yourself, believe me), you should still work hard, academically speaking. There's no excuse not to get an education when the opportunity is available, and despite whatever bad teachers/bad curriculum you happen to be enduring, you're still getting an education of some sort. There's more to being a pianist than sitting at a piano and rolling out noise - just as important is being a human being who lives and laughs and loves. You've got to discard the idea of the great pianist who lives in a broom closet practicing some secret technique for 10 years and then steps out to become the greatest musician ever. If that was your point of view... if not, sorry to lecture.

If you're a college student, it'd be much better to speak with a professor. Well, hell, it would be much better to speak to your teacher no matter how old you are.
They're the ones who made music into a career, and they know your abilities best of anyone. And I'll bet that pretty much any teacher you have, no matter how scary they seem, would be overjoyed at the prospect of their student taking piano as a profession into consideration, and would thus try to give all the best advice they could.