He always wants sex but I don't satisfy him

So since starting my new BC and because of a lot of stress going on in my life Ive had very little sex drive. I want to keep him happy but all my bf wants is sex. Every. Time. I see him. Practically every day. I feel that he doesn't care if I'm tired or sore he just wants to get off. I felt like he wasn't satisfied and I told him I was feeling like I wasn't good at some things and he just said that not everyone is good at everything. If I'm not good at it why is he always wanting stuff like that? I'm getting frustrated with this whole thing.