How Do I Fix This??

Me And My Boyfriend have been together for a year and 2 months now. And we always joke about how we met online and we both were just trying to do a “fuck and duck” 🤣🤣🤣. We both want a one night stand, we have been talking for weeks and both were talking to other people. Basically living out best single lives. Like I was his main focus and I was was still getting over a two years relationship.

Well, as you can see shit didn’t go as planned and we became fuck buddies. It was like the safer choice, we were cool, and all kind of other reasons. Til this day I do not remember how that formed into a full blown we live together, trying for our first kid, loving relationship. He was the one that made the move, I do know that because within our relationship He moves faster than me. I’m very timid about things. He said I love like 3 months in and I didn’t say until we made 6 months. He was almost at he’s breaking point.

Now I’ve said all this to give a backstory and it probably is very irrelevant. He has expressed that sex is not like it used to be and that, I have been becoming lazy. That’s from his side and I honestly agree with him. However, I was never not lazy (if that make sense). I don’t know how to ride dick, and I am very self conscious about being on top of him because of my weight gain. I don’t know what to do about that.😔😔

Now honestly I am more experienced than him and bed and I can do a lot of other things but with him I just never could do it. Like I try to suck his dick but it is so small that I just cannot get into it. He really wants that and I wanna please him. But I mentally just can’t get into it so when I rarely do, it It’s half assed. My ass is huge and he always joke about how it looks fake my legs don’t match my thighs ( they don’t) but that’s because I’m not a fit person and I am working on that. So anyway my butt did grow with my weight gain but I have always had it and I know how to move it and all that. However, in doggy style I cannot do anything. My back naturally arches and that can’t even stay arch for him.

I have never gotten any complaints before and I usually strive to please my partner and am very obedient in bed. We both love different sex kinks and it’s fine with me. We switch back and forth and I love that cause We don’t get bored. But it hasn’t been the same in 6 months (that’s what he said) And I love him with all my heart, I just don’t know what to do.