Feeling Distant from Family and Needing Support

I feel like i’m distant from my family and i can’t relate to anyone. My step dad is acting like a child and told my seven year old brother to not talk to me. I think i self harmed the first time that day. I couldn’t stop dragging a pen against me skin because how they came at me/ I was definitely wrong for yelling at my mom and him, but they constantly pick at my sister and her bad behaviors and i’m tired. I want to make a community of people trying to change for the better and make my own family. Anyone down?