So sick of home,want to leave but have nowhere to go?

since i started puberty, when i was about 11 or 12, my "mother"(i don't like 2 call her mom at all) have always been accusing me of lusting after my stepfather, or sleeping with him, to the point where he has left twice but he came back,because she begs him to,without him there isn't any income(she doesn't work). I'm 16 now,and seriously i feel like I'm so sick of this! day before yesterday, she has outright accused me of having with my own stepfather (who is more than twice my age) and last night at 2 in the morning woke me up to call me a ,slut and told me to stay away from her husband. that same day, a couple hours later at about 6 am she did the same thing,calling me a tramp and ho and to stay away from "her man". some days i tell myself just 2 more years,ill finish HS and go to college out of state to get away and do better for myself than she has done for me,but others days i feel like i cant deal anymore.My father already has his hands full with his own children and wife, and doesn't like to be bothered with my problems.i don't want to call police or anything because the last thing i want to do is go into foster care, I've seen too many kids get messed up in the system. what can i do.