Is this relationship ocd or do i not love her?

I swear i love her but we got intimate for the first time and it didn’t feel like i thought it would, i thought sex would feel like the best thing ever but it really wasn’t, it was just a sensation until i finished, sure it felt good, but i always thought sex wasn’t about it feeling good but the rush you get from doing something intimate with a partner but i didn’t get it. Ive always stood my ground in the fact that sex isn’t all that but i thought hm i really love her so this will be awesome. My mind is now constantly telling me i don’t love her, i swear i do, so much. I don’t know what to do