Sexuality Problems Due To Worry Of Relationships

Hello, I'm 16 and Homosexual. When I was 14 I discovered what gender I'm attracted towards and that obviously as explained above is Males. My school is a school that it's main priority you could say is sports besides the core subjects, Due to that we get pushed hard when doing sports and most males at my school are slim and fit. I myself don't count myself as one of those people but all my friends tell me I do and it makes me feel pulled down by my body image, Anyways our school has a Formal and Sport uniform and you have to change into your sports uniform before and after sports. When getting changed most of the guys get dressed outside of the changing cubicles and since I find the Male body extremely attractive I instantly get an erection. You could say I loose control at the sight of many slim, fit Males in their underwear getting changed and walking around. The main purpose for this post is that I'm extremely attracted to a guy in my class but I know he's Heterosexual but treats me as someone special to him and teases me in flirtatious ways, He sometimes touches my body such as my hips, neck, stomach, arms, thighs and even my ass and he makes me loose control over myself and makes me feel a overwhelming amount of pleasure. It makes me worry as you cannot deny who you truly are and it gives me fear that I won't find someone I can have a relationship with or spend the rest of my life with and it's something that hangs over my head constantly and in a way sometimes I deny my sexuality even thought I don't want to due to the fear of not finding someone to spend my life with.