How to be more active during sex?

Sorry if this is tmi but I just feel like I’m disappointing my partner in bed lately by not being very active. He is my first sexual partner so I have no prior experience. I’ve tried riding so many times and I really want to get better at it but I can’t seem to get the hang of it and whenever I get on top he begins to look bored or will sometimes get soft which is discouraging and a little embarrassing... Does anybody have any tips on how I can either get better at riding or do other things to feel like I’m doing some of the work? Please and thank you!!