how to improve sex life as a young couple?

Hello everyone; I hope this message finds you well. I’d like to tell you a little bit about my sex life with my partner, and perhaps you can help me understand what might be going on with me.

I’m (23F) and my boyfriend (25M); we’ve been together for nearly three years and have been living together for two. I’m fortunate enough to say that our relationship is quite solid, built on mutual respect and understanding, so I know that communication isn’t the problem. At the beginning of our relationship, I was the one initiating most—if not all—of our sexual encounters, since he was a virgin. Initially, he was shy—as was to be expected—but little by little, he started to open up. Things began to "fizzle out" when we moved in together and I was diagnosed with prediabetes and PCOS. I’m never in the mood (or rarely am), but the few times we do share intimacy, it’s quite passionate—it just isn’t as frequent as I would like it to be in order to please him. He has never complained or pressured me in any way; he is very patient. However, I know that he does miss that kind of closeness, and I understand that... I just don’t know why I’m never in the mood. Months can go by without any intimacy. I put a lot of pressure on myself because I really do want to make him feel good. It’s important to add that I have low self-esteem and struggle significantly with my body image and weight; I don’t feel entirely comfortable in my own skin (which is why we are both now going to the gym and eating better). I take antidepressants and Metformin; my goal is to try to get off them, as I know they have a certain impact on libido (I’ve been on antidepressants for about six years now).

If you’ve made it this far, thank you for your time, and I hope you have a wonderful day.