Craving sex

I have been with my bf for almost 4 years we are 18 and we have been having sex for about a year now. But the only issue is I crave it a lot more then does. Its only after weeks of not having any that he wants to. While i actually crave it often. I don’t know if it’s me or him. Or maybe because when we do it it’s usually all about me but that’s because that’s what he enjoys doing. I just assume his sex drive would be much higher than what it is. I guess what I’m asking is that normal or is it me or is it him or what do you ladies think.