I [26f] would like to have more sex with my husband. [30m]

We’ve been together for 5 years, and for the last 2 years my sex drive has been very low (2–3 times a month). I know it’s a problem that has to do with me, I often just don’t feel like it. I often think about something else during sex (e.g., what I did wrong at work today or what I have to do tomorrow), and it ruins my mood. I can’t focus on him. He used to try to initiate sex every day or every other day, but for the past two months he hasn’t initiated at all. We still hug and kiss, but I can see he’s been in a worse mood for a while. We talked about it, and he didn’t pressure me to have sex, but he said openly that he would like to have more sex and he would like to feel that I desire him. In general, sex is okay, he’s gentle (rougher sex hurts me), he puts my orgasm first, and we either finish together or he finishes shortly after. What’s wrong with me? I also often worry about whether I’m clean and about how I look (for example, I don’t want to be on top because I’ve gained a few kilos), even though he always says I look great and nothing bothers him. I want to be the best I can be for him, but at the same time I don’t want to do anything against myself. How can I have more desire for sex?