Sex drive MIA

my sex drive has been MIA for a while now, and I'm a little bit worried... I've looked it up and there are various articles about how women in their 40's may start to lose their sex drive... I'm 16. I don't think I'm asexual, but I just don't have any desire to do anything sexual and it's driving me and my boyfriend crazy!! any ideas? how can I get my sex drive back?