How do I (20F) deal with having different sex drives than my boyfriend (19M)?

Lately, my boyfriend and I have been facing problems over this whole sex thing. He has a higher sex drive, and I find myself having a much lower one, which has caused some frustration between us. He’s often disappointed that I don’t initiate sex, and I can understand why—it probably feels like I’m not as invested. When I turn him down, he gets upset and distances himself, leaving me feeling guilty and insecure. It’s not that I don’t enjoy doing it with him—we do have sex. I just don’t feel the same level of desire he does to do it often. I don’t mind that he has a higher libido, but sometimes it feels like he pushes for it even when I’m not in the mood which he says he respects, and I end up feeling pressured. I want to meet his needs without feeling like I’m being “talked into” it, but at the same time, I want to fix my low sex drive so we can both feel satisfied.