DO i have an affection towards guys?

I don't think you're going through hormonal changes other than normal puberty. It sounds to me like you are gay. All my life I used to think guys were attractive and I wished I could be that guy. My parents raised me as a straight kid. What else could they do? I thought I liked girls too, but when I was 13, I felt attracted to guys and guy's butts and this continued throughout high school. I pretended to like girls. I even had a girlfriend. Even though she and I would make out, I never had sex with her. We even went as far as to get in bed together, but I didn't do it. I didn't want to. I really liked guys, particularly my best friend. I was in love with him. Finally when I turned 19, I was with a guy from work and I realized that the feelings that I felt for my friend meant that I was gay. All that time I never thought I was gay. I didn't want to be gay, but I just was. My life changed when I realized and accepted who I am.

Either I am just really curious, or I am actually going through some hormonal changes...

You won't know til you experience some of the things you've been dreaming/fantasizing about. Living life is how you get answers.

You are bisexual and this is ok. There is nothing wrong with being bi. You just need to accept yourself and be proud of who you are in life. If your getting turned on by girls and guys then your bi. As for your friend that your not sure if he has the same feelings for you then I say you could always talk to him if you think he will accept you and see what he says about the way he feels about you.

Just curious.

*look a guys butts all the time* Fudge!! So this is the result of sagging?

Bisexual for sure but if not time will tell. just wait and if you still have all this then you are bisexual.