Living together before marriage??

I’m 18. I was raised in a Christian upbringing. Swearing, sex, and living before marriage are portrayed as one of the worst possible things you can do. I’ve had sex and don’t feel guilty. I’m incredibly happy with my boyfriend and believe is brought us closer. In the future, if I believe someone’s the one, I want to move in with them but I fear my parents would not speak to me because they are so Christian. My grandparents would be even more disappointed, they’re more strict than my parents. But how are you supposed to know if you want to marry someone if you’ve never lived with them? They could be completely different. I’m just conflicted on what I’d do in the future. Do what I want and feel would be right before marriage or please my family.