I don’t enjoy sex

I’m a 20M and i just don’t enjoy it. I’m not sure why, but i recently had sex not too long ago and after I thought to myself how i could be playing dark souls instead. Not sure why to be frank, I thought back more into my personal past and realized I never really enjoyed it, just something to do i guess idk. Is it normal especially for a guy to not enjoy it or really want it? I’m starting to talk to someone (pursuit of dating) and she really wants too and 100% of the time I’ll go down on her to have her satisfied but I won’t go any further than that, I mean my clothes are still on. I’ll just go clean up and take a shower then resume whatever it is i was doing.