Tips/advice for being on top if it hurts?😅

My bf always complains that he does all the work because I never get on top. I want to but I just don’t know how to do it comfortably and have it feel good for him AND me because it always hurts for me. He’s on the bigger side and long so I can’t sit all the way down on it without it hitting my cervix and it just hurts and I don’t enjoy it.. I also get tired quick because the whole time I’m trying to be on top I’m trying to support my weight and keep myself from going all the way down. I wish I could just use my weight for momentum and just “bounce” but it hurts way to bad when I do that. It’s like a leg work out trying to support my weight and my legs start burning and cramping we’ve tried many different positions but just can’t find one where it’s not painful for me. Does anyone have any advice? I’ve never had this problem with any other partner and I love being on top I just can’t do it with him😅😅 anyone else deal with this issue and find a way to make it work? I’ve tried being on top facing him, I’ve tried being on top facing his feet, I’ve tried putting my feet between myself and his legs, I’ve tried putting a pillow between us, I’ve tried being on his lap while he sits up, none of those have worked