Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
At your age I was also only physically attracted to men, eventually leading to gay porn and such. I labeled myself as bi-curious for years until I finally fell for another guy, making me realize that I liked both women and men. It's a weird situation because I didn't feel certain of it until I fell in love.
As for you, it seems like while you haven't fallen for a guy emotionally, you are definitely attracted to the male body. Of course, it may be a phase, but I honestly feel if you're seeking out, and going out of your way to find gay porn there might be something there. Just keep exploring, seeing what you like and don't like. Maybe you'll go through life only dating and being with girls, and that's fine. Maybe someday that perfect guy will come into your life and you'll be certain you also like men like it happened to me. Basically you're young enough where you can just live your life, go with the flow and see where life takes you. No use in labeling yourself until you're sure :)
Also please feel free to message me if you have any more questions/want to talk about this more. I feel like my story is similar to what you're going through.