You sound perfectly normal to me.

What you watch does not necessarily indicate what your sexual preference is.

I like lesbian porn too, and I'm a straight girl.

I also looove to death gay porn (the japanese kind called yaoi) but that doesn't mean I'm a gay transsexual lol.

You're totally normal. Don't rush into sex until you're ready and know the consequences, and how to protect yourself.

Until then, masturbate! I used to masturbate every single night in highschool.

Well, i wouldn't necessarily say your lesbian. I love to watch lesbian porn too. One night me and my best friend, a girl, talked about how we both like to watch it and we ended up hooking up! I'm not saying you should do it but i ended up being bi! lol... but you might not be. Its completely normal to be horny! Masturbate all you want. Don't rush into sex like Eiri said. Be sure your ready and be .S.A.F.E!!!! Use protection please!!!!!

me too i do i but after i h8 it i feel so dirty you should stop its not bad for u but if u do it offten u could get addicted good luck

I'm guessing from your reference to school that you're at an age where horniness isn't really something you have a choice about. Realize that over the years you'll level out. For now it's perfectly normal and perfectly natural. It sounds like you know how to manage your needs so that they don't manage you. Work on making making sure decisions of what you do and who you do it with are always made with your head and you'll do just fine.
If you like girl-on-girl porn it's very possible that you're bisexual. A fantastically large number of girls your age are. I strongly recommend not worrying about crossing that bridge until you find yourself attracted to a girl in person.