Physical Abuse From Both My Parents

My situation couldn't get any worse seeing as it's both of my parents.Not only have i been through physical abuse, but verbal abuse as well. My family often mock my OCD and my parents always openly show more affection to my 20 year old sister. I am a 17 year old girl and i have been physically abused for as long as i can remember and it wasnt even because my dad drank, i think it has been mainly due to stress. I have often been made to feel worthless and have even resulted to slitting my wrists because of the torture of being yanked by the hair, punched in the face, slapped, kicked and even been swung round from my legs. Sometimes my parents would act normal and act as though they lived and cared about me and the next moment i knew my world came crashing down over a tiny incident which instantly set the clock ticking. My parents often argue about a tiny thing which escalates into.a huge fight involving throwing down the stairs, screaming, crying, exaggerated suicide attempts and hitting, of which the police has been called.twice. All i keep doing is praying till i leave and go to university. But my biggest fear is that i will end up doing this to my own kids. I never want that to happen ever.