Sex help?!?

I love my boyfriend to death but our sex just isn’t the best and I’m not sure what to do. I’m definitely not in a relationship just for sex but he feels bad that he can’t please me like he wants to. I don’t moan nor do I really get into it and I don’t know where else to turn so I came here for advice. Im pretty self conscious and I get nervous or embarrassed a lot during sex because of my body. He always asks me to get on top but I turn it down because I am not comfortable with how I look and how big I’ve gotten. I don’t really like sucking dick because for one I just feel like I’m not good at it. We use condoms and a lot of the time I start out wet but as we go on it just gets dry and frictions causes it to be somewhat painful. I don’t know what to do and I’m not sure if it’s me, or maybe we just aren’t doing something right. We usually do a good bit of foreplay but even then I still end up getting dry after a few minutes of having sex. Any advice would help. I also don’t know what to tell him. Today he brought it up that he doesn’t like the fact that he can’t please me and he doesn’t think I’m sexually attracted to him. I do love him and think he’s hot, but my sex drive is SUPER low and for some reason it’s hard to make me horny sometimes, so I just feel like there is something wrong with me and I don’t know...