Confused

So my fiance and I were talking this morning right after sex because he got turned off mid sex all because he wanted me to go into froggy and I said I cant(my back and hips were locking at that point) I said I'm sorry hunny.

Then we started talking in how im not too bug on being on top but I've never really done it I'm not the type of person to just get on top

I dontt enjoy sucking dick and he has come to terms with it

He wants me to be on top more and he wants it to be 50/50 I'm so stuck on what to do like I try my best

He understands that I have issues with my back and knees

Ladies i need done help on what to do with my man i live him to death