should i be allowed?

             my bf and i been dating for five weeks now and my dad aka sperm donor  has been getting really abusive and it kills and drive me insane..............him hittin me..yellin at me...throwin me like a rag doll.....threating me ... well i left friday and didnt want to come back but my mom came and got me and took me home...... she understood where i was emotionally and how much i wanted to leave  and my bf told me that his parents are gone on  a vacation granet hes 23 and hes home alone so i thought it would be great for me to leave and get out of the house for a day just from tuseday to wendsday and just chill with him..but i told my mom and she said shell have to check with my dad and he said no so i asked her and she said no cause he said no.....  so emtional wise i was off the edge like i wanted to cut badly but my bf said if i go back to cutting or drugs then he'll leave me ....ugh so i just dont know what to do i want to head over there and i need to get out so ????? i told her to just lie to my dad and tell him im heading to a friends house but really ill be headin to my bfs house well my mom said no brittany im not lying for you .... then my dad said if i leave the house im not welcomed back.......ugh im going crazy  HELP!!!!!!!!!!! SO TELL ME: "DO YOU THINK I SHOULD BE ALLOWED TO HEAD TO MY BF'S FIR A DAY CAUSE I CANT TAKE THIS ANY MORE IM TIRED OF HIM HITTING ME AND HURTIN ME "  PLEASEGET BACK TO ME ASAP! THANK YOU