Advice??

Josie
I'm a 18 year girl and I'm sexually active. My parents think that sex should be after marriage. I'm scared to ask to get on birth control because of course they will say no. I was on birth control when I was younger because of my periods because the Doctors thought I had pcos. Anyways, I'm still living in my parents house and to them it doesn't matter how old you are but If you live under their roof you have to go by their rules. Also my insurance only covers some doctors I go to. Idk what to do. Any advice???