I want to move out..but my parents wont let me.?

Im 15, living with my mum dad and sister. I know ive caused them a loto f aggrivation over the years, im seeing a theropist and have deression. YEsterday they rang me when i was with my boyfriend tellign me to come home, i said no. In the end they came and foundme, brought me home and told me i wasnt part of the family. My lose friends' parentsh ave offered to ttake me in for as long as i need to give me and my aprents both soem time to think. I think this will be a good way becausei t will solve problems. My mums telling me i cant go. I wnat to go. What do i do, i cant bare to stya here anymore