What should i do, can he continue?

I am 15 year old boy. I live with my dad as my mum is not around. i hav not always lived with my dad. i used to live with my unkle but then my dad came out of prison. i hav lived with my dad now for about 7 month cause he was in prison, for dealing drugs. my dad has always given me wht ever i wanted and he always giv me loads of money. but last week i spat on his face as he was late and i was gettin really angry. i did not mean it. but for about 5 days he did not talk to me. last night he spoke to me and told me i have been getting to do wht i like for far too long and tht i wasnt goin to carry on like that again and he said cause i spat on him i have got to be punished. after tht he told me to take my trousers and boxers down and tht i was to bend over my bed. but i tolf him to kiss my ar*e. he then pushed my head into the pillo and jumped on top of me and loosened my trousers and pulled them off. he also took my boxers off. i didnt no wht he was doin. but then he said he was goin to me. his wait was to heavy for me and i could not get up as he was sittin on my back and my head was in pillows. he started hittin me with his belt, he hit me about 70 times. i was beggin him to stop, he just kept shoutin i had to learn i cant do wht i like. my bckside is red. i havent spoke to him and he says i hav to do washin and im grounded all summer holidays, i hav never been groundin before. when i went to use the shower this morning he came in and pulled the plug which turns hot water off and he threw me dirty towel which he had laready used. he never done anythin like this before and he says i hav to clean house. he says if i dnt clean up from top to bottom, he will give my backsde a tan. what am i goin to do???? i hav cleaned house and he told me to do it again and he pead on bathroom floor and told me to clean it. i hav cleaned everythin. i feel like he is controling my life. what am i goin to do?