Weight affecting sexy time

Hey ladies, I'm a 300+ sexy ass woman and I recently got involved with this guy who's dick is bomb 😉 but I feel bad because during sex he does all the work. I've tried riding on top and several other positions but it seems as though my out-of-shape-ness is hindering me from my sexual potential. My question is, do any of y'all experience this? How do you combat it? I want to be able to please my man the way he pleases me. 🙏🏼