Sex position advice

First Reddit post, but I hear you all give great advice.

I am a 37 year old female. I have been dating my boyfriend (35) for about four months. We have amazing sex. But I am not as experienced as he is and I am starting to feel a little embarrassed because I do not know how to be on top. I want to. But I am just really struggling with it.

I was married for about 15 years and lost my virginity to my ex husband. But we were not adventurous in the bedroom and rarely had sex. This was always an issue because I have a high sex drive and wanted to do more, but he was never interested. When we got divorced I dated a bit and explored sexually, but honestly…it hasn’t been great. Most men came almost the moment they entered me…or I was with men where their only goal was for them the cum so it never lasted longer than five or so minutes.

Well this man…he is different. It’s like his goal is to make me cum as much as possible. I’ve never experienced anything like it. And it is a game changer…the only problem is, I feel like I am having a hard time doing my part. I want to be able to please him as much as he pleases me. I’ve tried to be on top a few times and it kind of instantly kills the mood. I think my inexperience is written all over my face and it is very vulnerable. Also, I have a difficult time getting leverage because I am so short…my knees just sink into the mattress. I’ve tried backwards cowgirl but still the same issue. And I feel like I am going to crush him. I kind of broke down the other night and told him that I feel like I am bad at sex…he told me that we just need to keep practicing lol.

We are limited to the bedroom because he has full custody of his kids. I live and work about 30-minutes away so we spend our time at his place on the weekends.

Any advice on how I can be better at this? I workout regularly so I have the endurance and I am relatively flexible. But I think the main issue is my height and the plush mattress. Thank you all for your help ❤️