I'm not attracted to "gay" guys. How do you tell who is and who isn't?

So before I get into it, you should know I haven't actually come out yet. I'm 24m. I've decided that 2018 is going to be the year though.I'm not your stereotypical gay. I have a lot of straight friends, talk about girls (to fit in), would not be considered camp/feminine, and think it's going to come as a surprise to my mates when i do come out.The problem I think I'm going to have with this is finding someone. I'm not attracted to feminine guys. How do you tell if someone is gay or straight? How are people going to know I'm gay? And can anyone relate to this?