In this situation , if yu were me what would yu do move out or stay?

okay here is the story short, my family- unapreciated, threats me alot to get there way, i barely go out much, my 4 yr old autistic brother ever since he was born i was taking care of him , my mom works 16 hrs mon-friday, dad stays on the computer 24-7 selling and buying on ebay and listening to youtube christian people talk about there theory of the end of the world. hmmm... should i stay or go? now the boyfriend and his family- the stepmom freaking psycho *** ***** and idiot sells ilegal pills , the dad kool guy , the lil sis is only 4 , the boyfriend he helps me with everything he just wants me to learn how to be independent . NOW i moved out cause my parents were too much for any 18 yr to handle like for example i have to be marry so i can move out no matter what my age and if i dont marry adn move out anyways they would abuse me physically, now im leaving with my boyfriend and his family , but tonight he and his stepmom have been having there " hate each other fights" you know and i dont mind but this time she got me involve with me not doing absolutely nothing and im a very nice and quiet girl and also one of those that really hold a whole bunch of shiet but there are times that it just gets to me in a way that AHHHHHHHHHHHHHHHHHHHHHHHHHHHHH yu kno ok tell me should i stay or move out again?