friend?

my friend always dont seems like a friend- shes always slapped me (painfully T-T) slapping me at the butt andd touching my leg (painfully again) and hurting me..... i also ever bought us a matching jackets with $25...(hey $25 in my country is too much) everyone asked why did i be friends with her. shes also a stupid person with bad marks and always fight with the teacher... shes always steals my food aka fried chicken. (bc thats her fav) idk why but shes the only otaku friend i had...Is shes a bully? should i cut ties with her? please tell me....