I keep forgetting to bring clean underwear to change into after showering at the gym
What do you end up doing instead of changing into clean underwear?
I might have to walk home without any underwear on.
It's understandable that we forget somethings sometimes. You should make sure you bring fresh clothes next time.
I don't have time for this, I 'm going to walk home with no underwear.
It may be pretty uncomfortable to walk home not wearing any underwear. Just do your best to make sure you prioritize having underwear while in school. It is not appropriate to be walking around with out in school.