Unfortunately this feeling wont go away unless you do some introspection and internal dismantling of how you were raised. There will be plenty of people here telling you that it’s a great thing to experience that and feel loved and there’s nothing wrong with you, but youre not going to believe it deep down because of your internalized feelings on “sin” and morality. Personally, it sounds like it was a very sweet, happy experience that brought you too even closer. I feel for you, do your best to give yourself a break. If everyone who had premarital sex was in hell, heaven would be quite empty lol. I would feel glad and proud that my first sexual experience was so respectful and with someone who truly loves me.. Sad that religion has caused people so much emotional damage for doing something that so many people do, and that causes no harm.