How do I increase sex drive?

Hey ladies, so I have never been a super horny person, but my boyfriend totally is! It's not like I don't want to have sex, it's just that I never really have the craving for it. And when we do start, I usually don't mind if we do it or not. Also, I've never really had the "mind blowing" orgasm everyone talks about. Are there ways I could change my hornyness? I hate leaving my boyfriend hanging so much when I'm just not in the mood (which is very often).