Life doesn't seem worth it...?

Im senior and I just feel like I can't take all the bs life has to offer. Im tired of all of life’s problems the majority of people in this world are snobby, selfish, and complete a$$holes to people. The times when life’s seems good is rare and then 90% of it is constant depression and hopelessness. Im addicted to and I try to stop so hard but I can't break it... The only thing that has keep me going on is God (Christian) but I just feel like well he probably doesn't exist he never helps me when I ask him to. I just want to tell myself he's real and everything’s all right but in reality it seems like it's just a messed up world with millions of children and people dying. Diseases everywhere, people crippled, constant wars, and hateful people. Since my childhood I have been depressed and felt lonely. I feel like I have no use and that I be better of dead. Yes I know that it would hurt my family (one of the other reasons I continue to live) but im so sick of life. I don't want to live, right now. I do bad in school, and some people in school just don't get me and are cruel even though I have done nothing to them. Girls don't seem to like me (thought some people think I look hot ) and I just feel like I fail at everything in life and that I can't do anything right. Another thing that holds me back is if there is a hell and I can understand why it would be there. Im just trapped, what it gets down to it the world is just a evil place. I don't get and if there is no God than the world and all it's troubles isn't worth it and id rather have never been born. I don't know what to believe. I really think of suicide a lot.