It isn't just you. Your sex drive is dependent on just how much sex you get. There is a proper medical explanation for it but I don't know it off the top of my head, but in short you're getting yourself addicted to the chemicals that are released in your brain each time you orgasm.

If you take even a day or two off from hot furious orgasmic fun you'll notice your sex drive plummets.

I am the same I just want sex more if I play with toys. So not just you!

I used to talk to someone who used to play up to six times after she started masturbating, im sure other young females and maybe some guys have the same thing. It could be one of those things which isnt talked about since its too embrassing for people to talk about