What do i say to my family?

I'm a 16 year old girl who doesn't believe in god. How do I tell my family who are christians? I was planing on not tell them till I get older and move out but every time they make me go to church I get mad listening to the service. I can't take going anymore. I believe we go somewhere after death I'm just not sure where. I think we should just live are lifes in the now. I don't won't anyone posting how I'm going to hell or how I need to accept jesus.