I’m lost

Hi all, I am a 15 year old male, and I'm scared and lost. I don't know if I'm able to go into a lot of detail right now, but basically I live in a very Mormon household, and I've started to slowly tell them I don't want to be part of the church. I have done more research on it as I have gotten older, and I don't want to be a part of it. I still respect all my friends and family in the church, but I don't want to attend anymore. My parents told me this morning that If I think I'm "responsible" enough to leave the church I'm gonna have to start making all my own money and paying for my own phone bill because they aren't going to anymore. They also said that I should make sure to buy condoms for me and my girlfriend and don't smoke too much pot? I've never smoked before and me and my girlfriend both have boundaries and don't want to have sex until marriage. Part of me doesn't want to leave the church because I don't want to disappoint my parents. I honestly don't know if anything I'm saying is making sense but I don't know what else to do so l'm just trying to see if anyone has any advice.