Somebody please help me on this it's really important!!!!!?

Okay so i'm 17 and I recently moved to CA to live with my dad and stepfamily. Plus I have a 14 year old cousin that lives across the steet. My stepmom has 4 kids 3 boys and 1 16 year old girl which I have gotten along with great until this past week. She just stopped talking to me put has started talking **** about me with my cuzin. we all used to walk 2gether to school but they don't want 2 walk with me n e more. I don't know whatz wrong with them. It just seems like they hate me for no reason and I feel like crying cuz I miss hanging out with them. So can some one please help me ?