NSFW Don't know how to figure out what I like in bed with my girlfriend.

Ok so I'm using my throwaway for this because people who know me on my regular account don't need non-anonymous details about my sex life.

I recently got a girlfriend, first girlfriend. I was worried about having sex because I had never had lesbian sex before, I was afraid I wouldn't be able to figure it out. Well there was no need for worry on that front because I figured out exactly what to do and when to make her extremely happy. There's just one problem. I don't know what I like from ladies sexually. I do know it's not whatever my girlfriend is doing down there. I don't know how to tell her that without hurting her feelings especially since I don't know what I do like to give her more clear direction.

How should I broach this subject? What should I say to her? I don't want to hurt her feelings but I love seeing how much pleasure I give her and I just want to feel some of that too.