How can I hook up with a guy in my teens when I don't know if they're gay?

I'm 15 years old and I'm not attracted to the stereotypical muscular attractive men. I'm more attracted to the big, sort of chubby men with some weight on them that show masculine characteristics.I really like a man with beef on them, they're confident, they aren't shy and they can have sex with me.I've been getting really aroused lately and it's bothering me because I just want to fuck someone but literally it's so hard to find a guy I like because people just don't publicly admit they are gay, especially in high school. I just want to have a relationship with a guy without no one knowing and we can just have sex anytime.I'm not sure if this is stereotypical but I can tell who is gay and who is not but usually the gay ones aren't appealing to me. It seems that all the straight guys are hot. :/It's not easy as you think. You just can't go in the locker room and take off their shorts and see their reaction if they like it or not and what are the chances of them being gay anyways?It's just so hard for me and it's not like I can go on a website and look for someone because it would be illegal. :(