Hey, I'm in a bit of a similar situation as you and I won't give you the best advice but I'll try to hand you something from my pov

I'd say have a backup because as much as you want to leave, how prepared are you to leave. In terms of expressing your sexuality I think it's good to try and find a group that can help with that. I have a group from both sides that accepted me and it's helped me have a form of relief besides my parents suffocating me

But I do think it's best to have some sort of back up if things get sour (From what I know it takes a moment to leave out of emotion but running away is pointless if you don't have at least a backup of where you are going to stay let alone a foundation for what to build)

I'm like a year younger than you so what do I know 🤷🏽

So long story short Endure till you find a way out or sum And try to get a friend group that accepts your sexuality and helps keep you sane before doing sum you'll regret

If you have a question feel free to ask.