ABUSE. points if you answer?

okay so I'm in 9th grade and about three months ago my boyfriend started abusing me mentally and physically. it started out he would just sit on top of me & choke me, pull my hair, slap me, etc. but things are starting to get worse, now he punches me, s me, spits on me and he even threw boiling water on me the other day. i know i shouldn't be in this type of relationship but i WANT to be. i actually enjoy the abuse, i try not to..but i cant help myself. PLEASE HELP IDK WHATS WORNG WITH ME OR WHY I LET HIM TREAT ME THIS WAY :(