...turn them all on and it would become a pretty nice steam room. Then after a raucous afternoon of beating ourselves up play flag football (that always turned into tackle) we’d soak the aches and pains away on P-day. the showers were great.
As for the shyness of showering in public, when I was in junior high our gym coach made everyone shower after class as part of learning about hygiene. If you thought it was awkward as a grown adult times it by 10 as a self-conscious pre-teen in the middle of going through puberty. We hated that gym coach but it beat the awkwardness out of you.