Riding tips??

Hey guys, so I’m having a hard time.

I used to weight 450+ lbs over the last 2 years iv lost 252. Iv lost a lot but I’m still a bigger girl. It’s really embarrassing but I need advice on how to ride my fiancé better. We normally doggy an he likes to bend me over things but I feel like it’s getting boring for him to always be doing the work. I’m just not confident on top, because of my weight loss/ the lack of knowing how to move my hips and body overall...