I'm bad at sex.

I've never had a partner I could f**k back. Meaning I've never been with anyone and had lazy sex. With my new partner I literally can't do anything but cum and hold on to the side of the bed. His size (girth) just kills me that all I can do is lay there. I'm wet enough (tmi: to the point I'm dripping) but I can still feel the pain of being stretched out. He says the sex with me is good but yesterday he mentioned how he did all the work. I need to figure out what to do to be better for him.