I can easily envision your isolated, soon-to-end situation and your presently having no visible bridge-to-the-future ahead of you. I can also understand calling the police and such only helps when an actual law has been broken...and it seems your parents have not done that.

Your profile indicates you are in Tn, so maybe take a look at this:
You obviously cannot presently meet all of those requirements, of course, but I suggest you begin talking with your friends and their parents and asking for some help in finding a case worker or attorney who will present the court with some kind of petition on your behalf. Maybe a friend's parents or some state-recognized foster parents would be willing to take you in under a guardianship of some kind, and I would guess there are people who would be willing to help financially once a solid course of action has been set into place.