Why shouldent i kill myself?

I'm 18 years old, overwight, have very few friend, I'm anti social so don't tell me go out and meet people because its not that easy, I got made fun of in school since 4th grade, left public school to go online to avoid being bullied, people would call me fat, stupid and ugly and hit me. I'm not smart so I failed a lot of classes, so I'm never going to go to collage. I don't really have any skills, id make a good house wife, but I've only had one boy who would date me and he cheated on me the whole time and only dated me because I was willing to put out. I live with my parents who fight all the time, they don't love each other anymore and it shows, I have two older sisters, one who just passed away in january and one who is in jail. My sister who is in jail has 2 sons that live with my family, both of whom act up all the time, just like their mother but no one will treat them so young and I can't handel the stress of raiseing two kids who misbehave that arnt even mine! My mothers mom treats me like **** and makes me feel like I do everything wrong, I think id be fine if I could just move out, but I can't get a job, have no money, and nowhere to go....ending it now seems like my best option