Some of you neckbeards are disgusting. In my school, if you were in Gym, you didn't shower after. It's probably something you can get over. And not everyone wants to be ogled. Our teams though have to shower though depending on when they practice.
Also, since I frequently swim, I typically take two showers during a single gym visit - one to rinse off before getting in the pool and one to rinse the chlorine off after getting out of the pool, so I have a decent amount of experience with showering at the gym.
For the swimming unit, we could shower afterwards, but we usually had our bathing suits still on. Even the sports teams didn't shower after practice. There's a dark side to JD's snark. I don't think you've done anything wrong. My high school was like yours.