What do u do when u have big problems and you do stupid things to get rid of them ? & i have family prblz hlp!

i have family problems like my brother makes me cry for no reason and then he won't let me speak for myself and if i do not listen to him then i get hit or i get humalitated and its not very nice and my family always has favorites i wish i had a mom that i could talk about my problems and a dad that will quit talking about my weight in front of everybody..............................i have a question to all of you people reading this "is it bad to leave your family and go get adopted by somebody else? " it hasn't happend yet but if i do ever have the idea of leaving my family what should i do????? I REALLY NEED HELP?