My punishment from my girlfriend.

Is it normal that when I do something wrong my girl friend punches me in the balls and ties me up.... When I come home and she is mad at me she hides in our bed room and hits me. Then she ties me up in one of our chairs. Then she slaps me getting in my face saying mean things. I cant move she just yells at me and hurts me. One time she kept kneeing me in the balls and whispering do you like that. Then this one time she hung me up on a hook with a wedgie. I was in a thong of hers she made me put it on. And a bra. Then she took pictures of me and made fun of me. I dont know what to do if I bring it up she just hurts me. What do I do!?