Well, you're more disciplined than most. Certainly, the majority of guys will be straight... unless it's a gym that specifically or historically attracts a different clientele.
You don't need to show off, of course, but lots of guys shower there because it's immediate but also because of that indefinable "locker room vibe," where guys are comfortable being naked with other guys. It's not necessarily sexual, but it can be masculine-affirming. Of course, nowadays, so many guys, even college guys are too shy to get buck naked in a locker room and shower. Pity.