I need a reason to keep living?

I live in what is the definition of a dysfunctional home with constant arguing between my grandmother and parents since I was young and often being treated like a child by my lazy dad who enters my room and takes my things without my permission all the time. I love them all but my mother is the only I can talk to. From the third to the eighth grade I was bullied relentlessly which destroyed my self-esteem so even today, four years later, it is dirt low and only because I went to a different high school with all new people. I am alone most of the time and this loneliness really hurts me a lot. I have friends but none near me and I don't have a girlfriend often believing I never will and I'll be alone forever. Should I keep going or end my life, I don't want to but I don't know if I can resist and at times I really don't care about anyone but just ending this pain. No telling me to find God, Jesus, Buddha, etc. because I'm an atheist.