IS HE GAY?

i know some guy nd Idk if he's gay. I'm not trying to be mean,but he has really good posture which doesnt look normal and he's emo which I know some emo guys are gay. I dont mean to stereotype anyone; I just need answers. He's a swimmer and I heard swimmers have good postur, but since he has such good posture it make him look weird when he runs. He stares at me alot and it's creeping me out (I'm a girl). Everyone thinks he's gay, but I think they are all stereotyping him. He also has a low voice