Sex before marriage

DISCLAIMER: I posted this in different groups for differences of opinions, Christianity is mentioned as well so please don't knock my beliefs!

Hello all! So my boyfriend and I have been dating for almost 2 and a half years. We have been living together for 6 months now. We did have sex on our first date and we have been regularly doing it since then. I lost my virginity to him that day but he lost his virginity to his ex before getting with me (which also slightly bothers me because, y'know soul ties). We both grew up around Christianity (both of his parents are pastors and my uncle is a pastor) so we know that sex before marriage is wrong. He's wanted to stop a few times but we could just never do it. Now I want us to wait until marriage because I am on a new path in life and want to live the right way. I know it will be hard because we live together but I'm really concerned about getting married just to have sex. We absolutely love each other and have already been discussing possible dates for when we want to get married but now that we want to wait to have sex I feel like we're just getting married to have sex again and it feels wrong. Am I just tripping? Also he's about to turn 21 next month and I'll be 20 in December and I dont want everyone thinking we rushed to get married or that we're too young but honestly we just want to live right in God's eyes and I know that he's the one for me.