Confused…..

I don’t know what to do. I cant decide if i want to stay living with my sister. I mean i love her to death and everything. But with her finacee and her three kids its hard i’m not used to it even if i have been living with them for about two and half monhs. I’m usaully never home or atleast i try not to be. But honestly i dont feel like i can live with them. I dont exactly feel part of their family. I also feel like i’m a burden. I’m grateful for them letting me stay with them but her finacee and me do not get along to well and he doesnt try either to get along with me someitmes and i admitt their are times i dont try at all. He kept giving me lectures about how i was being ungrateful or how he thought i was ungrateful because i wasnt showing it. Also that I’m a mean person. It almost made me to start to cry. when he was saying this to me i was about to go into my school. I asked couple of my friend if that was true and they said hes just trying to bully you and everything. Lately he hasnt said anything to me in the last two weeks or so but he hasnt had the chance either like i said because i havent been home enough. I mean i dont stay their for free they get money for me to stay with them. So honestly i am not just staying their. I just dont know what to do whether to just move somewhere else or live with them because if i do end up staying with them longer things have to change.