Girl with high sex drive normal?

I'm a almost 18 year old girl and I think I'm addicted to sex, I watch porn like every night even if I'd had sex with my boyfriend twice in that day and he's too tierd to go again, he just can't keep up with my high sex drive and all my fantasies, but I've been gradually thinking I may have a problem, I don't know who to go and speak to about this? Maybe my GP? Also any tips to stop feeling horny all the time ? I'm quite worried

Oh and sorry my question is in singles and dating, thier is no category for this, pointed that out because people complain about not being in the right category.

Thanks