Can i leave my grandmas house?

Ok i live with my grandma on my moms side. All she does all day is scream holler and tell me how much of a **** up and how im a slacker and everyday she tells me im worthless and shes gonna give me up and shes gonna put me in bootcamp and how just overall worthless i am and everyday i try to do wat she asks and i do everything she wants trying to make her happy so she will stop yelling at me but she still does nothing is good enough for her and she is never wrong. Well lately ive been trying to talk her into letting me stay with my dad but she just says no and then she says she doesnt want to take care of me and she cant wait for me to leave. see not to long ago i had to go to a foster home and then she got temporary custody while my mom is in jail and my mom isnt gettin out for awhile so ive been trying to leave and she always says oh ill find you a place ***** and it just seems like the only way im going to get to leave is by going in another foster home so if im leavin shes makin it so im still unhappy but ive been thinkin because my dad is doing good and is back on his feet wat if i just leave but i dont know wat will happen if i just leave and im 14. so plz give me some advice people i really need it