I sometimes seriously feel life just isn't for me?

I'm sad and I'm tired of always fighting with my mom. When everything's going well with her something always happens. ALWAYS. I have problems at school and I might repeat grade. The people I always considered my best friends turned their back on me. I feel fat and disgusting. I'm just sick and tired of suffering. My big brother and little sister hate me. I just don't know what to do anymore. The guy I'm inlove with probably doesn't even remember I exist. My only friend from school always orders me around and the worse is I follow... I feel like I'm just dead. I hate everything about my life. I forgot to mention- I sometime's daydream about my own death. I think about how much it'd hurt to get hit my a truck or almost any other way of dying. Early deaths. Painful ones too. I ask myself how people would react.