Annoyed to the brinck of self harm :( ?

I am 18 and I live in the UK. I live with my mother, father and sister. Currently the situation at home is horrible as I don't get along with my dad, we have constant verbal arguments and sometimes these turn into fist fights, my dad don't love me and I know that by the way he treats me, he treats me like crap. I live in Bristol and most of my relatives live in Plymouth so I can't go and stay with them because of college. Once when I was younger my mum told me I watched him beat her up and my older sister was hugging me so I could not see. He scares me and makes me feel upset. The other night he pulled my hands away from my face because I was crying so I pushed him over, he flew at me and constantly hit me and my mum broke it up. He walked out. He is back now and no one is speaking to me, but they are speaking to him. They blame me for everything. I just want to cry but I can't. I can't bring myself to cry, I tried cutting myself and everything, but stopped when I saw some blood. I want to move out but I got no money or no job. Please help me :(