Suicide or running away?

I have been having so much problems lately, school, homework, parents, even working. I'm only 13 but the stresses of my daily life have gotten to be so much I can't take it anymore. Because of my parents, I dream of getting out somehow. They expect so much of me and think of me as a failure when I don't live up to their expectations. They yell and scream and I feel like I am the source of all the problems around the house. I have 2 older sisters that set the expectations of the household. Both are succesful and on their own now. My parents don't understand that I am not like them. I try to explain my feelings to them but it just ends up becoming a screaming match. I have tried so many times to let them know how I feel but I can't live with them anymore. Even little subjects become major problems to them. I think I might have depression and/or ADD which has been troubling to me in schoolwork and such, but my parents don't understand. I know being a teen and going through puberty comes with it's problems and challenges, but somehow mine is different. I need some guidance from anyone who can relate to my pain. I need a salvation, a way to get away. I like to feel that I can take refuge with my church but I feel as if they discriminate me for my bi/homosexuality. I don't know how the bible/god see me with all my problems. Please, anyone, I just need help!