Women who are dominant, what do you get out of being dominant? Submissive male here feeling awfully selfish for being submissive

Hi! I'm not in a relationship or looking for one currently but I know I'm a very submissive person, I've had submissive fantasies since I was young. Though I do know with me being a virgin I'm hella inexperienced I know fantasies and whatnot can probably change but with the few encounters I've had I really do feel at the very least, I'm very submissive sexually but I can switch and be a bit more dominant (I like the idea of edging my gf, tying her, being really rough in general and doing a lot of aggressive foreplay if that works)

I guess to have this discussion I should discuss My fantasies a little. They range from being demanded to do oral sex for hours, wearing feminine clothing (mainly just underwear and lingerie), being roughly ridden, edged Esp while im pleasing her/giving her an orgasm, blindfold/roped, being flustered is a huge one for me. The few Doms I have talked to online/twitter said I'm probably considered a "very soft and very needy" sub and I think that's pretty accurate. I would only do this in a serious relationship where I'm open to expressing my love, devotion etc. so the thing I "get out of" it is a very intimate relationship where I'm acting like myself but also thoroughly devoted to pleasing her. I also love the idea of doting on her throughout the whole time if that's part of any labels lol

It's just I feel with me being submissive I'm not sure how to do really good foreplay and sexual acts outside of oral sex (personally I love the idea of going down on her forever right now lol). I love the idea of having foreplay done for more than an hour if time is applicable for it, but I guess I'm not sure how to do it submissively? I know i get really into foreplay I love being kissed and touched on my neck/breasts/ass etc and I would love to do the same, of not more but I guess as a sub I'm confused on how to please her as much as I would probably be pleased if that makes sense? Like I keep feeling in my head I'm being really selfish with being submissive but I feel that's maybe inaccurate?

Any help here?