just fuck me already

I need a little advice my boyfriend and I have been living together for over a year now he's 22 and im 19. lately I have felt like our sex life is shit im always down to do it but he's not I've felt like I've tried everything we have talked several times about this issue I tell him how I feel like he doesn't want me or that it's boring or what ever it might be I've tried getting answers from him by asking what I can do to help and literally just says it's not me he's just not in the mood. I don't know what do to anymore it literally just makes me want to cry because I love him so much but it makes me feel like a shitty person almost like it's my fault he doesn't wanna have sex even though I know it's not. its almost been 2 weeks since we have done anything. am I over reacting orrr?