My dad hits me often and I want it to stop

(this is my first ever reddit post. If I break any rules PLEASE let me know before anything happens if you guys can. I don't want to hurt anyone or myself, I just want to defend myself.)

I am a 15 year old boy who was adopted by my Aunt years ago. I am in a troublesome situation. My dad (in his 50's) has been hitting me for a while now ( I live with my aunt but whenever she gets mad or tired of me she sends me to my father's, which makes me sad) and I want to show him how I feel. I wanna beat him down and stand up to him. I have nobody to trust but my friends, which is sad. The story goes like this (summarized from this week) I was sent to my father's to wash clothes because our washer is messed up. He was fine at first, I did what he asked and cleaned his house (Usually the only productive thing to do at his house is clean up for him, and it makes me feel like a slave more than son) but yesterday I was supposed to go home, but my Aunt postponed it to today (still waiting as this sends) . He didn't like that. He is currently dealing hardships with his girlfriend (my mother lost custody a long time ago and this is someone entirely different) so he starts getting aggressive. Everytime I tried to speak he acted like I was being disrespectful so he came up to me (I'm on the couch in the corner) and He corners me, and starts hitting me. (I don't know if this is a valid reason, but sometimes I don't do chores around the house) He slapped me hard and I kept my cool, and kept wiping my tears. I guess he didn't like that because he continued to slap me over and over again until I yelled at him to stop, to which he punched me right in the nose. I screamed and he told me to stfu. I have a picture of the aftermath and ill probably show that if you guys want. He threw my phone at my face, and it hurt badly. I saw blood drip onto my phone, and I could barely sleep that night. Now today, he got in my face again, and I was still to scared to talk or fight back, but I felt like defending myself.