Is it normal that almost everything turns me on

I'm a guy, 17, bisexual and I'm horny all the time! Pretty much any adult or teenage gir/guy (less of guys) that is decent looking turns me on. Today I was sitting in class and we had this substitute who didn't have a bad face but just had this big ass and I had a boner for an hour. I also jack off about 3 times a day. Is this normal?