Should I move to dad or not?

So now I'm in exam year and it just started but I'm already stressed, not like i wasn't before though. I have divorced parents and still a minor so i live with my mum, that I choose only because I knew she needs my help, also having 2 other kinds besides me, one of them a toddler. Now I'm regretting my decision because we fight everyday, i have insomnia cuz of the anxiety, that she gave me btw, of her going through my phone and finding out I'm gay and I don't believe in God (she's Christian and homophobic). One of my biggest fears is for my mother to hate me or think of me as a dissapoitment so i obviously don't want that. And everytime we fight she makes me feel like the bad guy, so a little gaslighting there i think. I think.
Now, i can move to my dad if i want, and kinda do, being very much unhappy to come 'home' after the stress of school just to have more stres and sadness at my mother's house. But she told me that if moved to dad, she's never lend me a helping hand ever, and that'd mean dragging with me one of my brothers, who's 13 and is very attached to me, as i was basically the one raising him when we were younger and our parents fighting.
I don't know what to do and I don't want to burden my friends with this. Any opinions/ tips on what should I do?