What is wrong with me?

I am a 15 years old boy and want to die. all i ever think about is how horrible my life is and how lonely i am. it seems like no one cares about me. i want a girlfriend so much but it seems like no girl likes me and im to afraid to ask a girl out. i live with my dad and stepmom because my mom is an alcoholic. my dad always pisses me off and yells at me. i know parents yell at you because they want whats best for you and love you but i hate it. when i am around my dad i just want to scream at him and punch him in the face. i am so depressed. i always think of committing suicide but i know its a sin and i will go to hell if i do but i want to die. my life is too unbearable to live. i need someone to talk to. please help.