I'm happy to want to pursue your passion -- that's great! I have a couple of recommendations: One is to "talk-turkey" with whatever summer/year-long ballet training programs you may be interested in. Just because you cannot afford it/them, doesn't mean you cannot go. Most have some kind of financial aid available to students, particularly if they are "interested" in you and your potential.
One college-level place that I highly recommend is the University of Utah, which provides professional training and a high level of academics. I've had several former students attend and each have had really good experiences. Bené Arnold is the Interim Chair of the ballet department and one of the best teachers anywhere.
Continue to take every class you can get your hands on. Also, be sure to read about ballet and dance history, biographies, and see as much live and on-film dance as you can. The more you know, the better prepared you will be. Best wishes for happy dancing!