Sexual Frustration

So my boyfriend and I have been together for 3 years. Prior to being with him, I was in a very sexually abusive relationship, which has never bothered me. With my current boyfriend I always made the first steps and felt “in control” in a way, and have been okay up until recently. We both still live at home, and I really think covid took a harsh toll on our sex lives. For some reason whenever he tries to make any advance to have sex with me, or hint, I get incredibly uncomfortable and nervous. He’s never done anything to put me off or be harsh and is constantly checking on me to see if I’m okay. It’s to the point where he is continuously checking on me because I “look uncomfortable”. I especially feel bad that when I do open up to having sex, I make him feel bad and it’s an all around crappy situation. I don’t know why 3 years into our relationship, this has caught up to me. It’s a terrible feeling and I almost feel like I have no credibility to bring it up, since this is relating back to a relationship I was in 4+ years ago. I also have become extremely self conscious, and just flat out uncomfortable with myself. I don’t know what I can do to feel better about this situation. I use to have a very high sex drive which could have naturally decreased, but it feels non-existent, while my boyfriend’s has been higher than ever. It’s causing a lot of stress in our relationship. Has anyone ever had this? Does anyone have any advice?