I'm really attracted to 3 of my guy friends and a couple of girls too

Ok so I'm 15 and a boy and I'm really sexually attracted to 3 of my guy friends and a couple of girls too . But first thing first I just love everything about them and I would do anything to **** them or get me **** or just suck there **** I would do anything there so hot to me . Soo hear is the problem my friends zack is in my class and is always beside me and I really love him sexually but he doesn't know that . When I go home I jack off to his pictures fantasizing that I'm getting banged .. One time he was next to me in class wearing lose shorts  and when I'm around he is always touching his junk and looking at me and saying it itchy....  but one time he scratched it he got a giant boner and he just looked at me cause I got a glimpse of his penis sticking up in the shorts .. He didn't say Anything to me.. But in my minds I wanted to grab is penis and suck him off so hard ... my question is ... Am I gay? Is he sexually attracted to me too?  What can I do to suck him off ? I need a serious answer I'm in hell right now :(