I’m struggling

I don’t know what to do... I’m 16 living with my mom. All we do is fight.... she been with her boyfriend for two years and we were getting along great but he treats me differently then he treats the other kids. Him and my mom always tell the other kids they love them and no one ever tells me. I try to act like I’m okay but I’m not. Nothing I do is good enough and I’m blamed for everything. My mom allows my older siblings to treat me like complete crap... even to the point one of them puts her hands on me. I’m failing all of my classes and am already way behind to the point with two years of summer school I’ll still need another year. I’m beyond stressed out and I’m really struggling not to turn to old habits... I’m really trying to stay clean but it’s so hard and I have no one to turn to. I just lost my best friend and I have no one in my corner. I’m in love with someone who doesn’t know I exist. I feel overwhelmed and I don’t know who to talk to...