I'm 25 and my parents scare me...

Only a phrase can make me super anxious: "we need to talk, you know about what". Sex is what she means. Religious upbringing, I could be 30 and they wouldn't approve of sex before marriage. But somehow she knows I'm doing it with my current boyfriend. My parents found out I wasn't a virgin right before I turned 18. The experience was horrible. I was almost sent out of the country, they took my laptop and phone. My mom threaten me to publish slutty Facebook status on my account. To this day there cannot be a conversation about sex without me being scared. I can't even look them in the eye. She even hit me that day. My father called me names, bad names that I can't translate to english. I was grounded for a while. Even tho I'm 25, it feels like they still see me as a teenager. I'm scared for this conversation. I'm scared they will take my car away (it's under my dad's name even tho I pay it) even my phone, it's under a family contract. This is driving me crazy...

Edit: the reason I can't leave is because I'm not working at the moment. I'm finishing my master's degree and I have to do my clinical practice at the same time. So I study and practice full time. My boyfriend and I are studying together, so he has the same situation. He lives with his cousin only paying $200. So what we have in savings he pays his rent and I pay my car.