Tips on how to ride

I’ve been sexually active for a while but I just never did any other sex positions with my ex but now that I’m w my new boyfriend it’s kind of a different environment that I’m not use to and he’s open to try new things I haven’t really had much experience in. Ive struggled being on top and it doesnt really seem like he’s into it since I’m not really sure what I’m doing, I just need some advice or tips pls.