If you have an abusive father, you need to get that documented NOW. Through school, clergy, psychologist, etc. FAFSA has very particular requirements as to who can be considered an independent student. If you can't/don't meet these requirements, your parents income will be considered until you're 24 or married. Legal emancipation is not longer the determining factor, as it was for many years. You could leave while you're still in high school, and have the school declare you endangered (even if you're staying with friends), or, if your mom agrees to leave (or has left), apply to FAFSA only schools. It doesn't matter for FAFSA if they're still legally married or file a joint return - if they live separately, you'll only use the custodial parent's financial info. Use the link below so you understand the requirements of FAFSA.
My recommendation, if you have great stats and EC's, is to try for as close to a full-ride scholarship as you can find. Choose your college list carefully, with alot of research, and get out from under the s.o.b.'s thumb.
http://www.ifap.ed.gov/efcformulagui...aGuide0910.pdf