The empty school after hours sounds completely different. So do you when the crowd’s gone.

A building full of people and the same building empty are two different places, and the second includes a quieter you. Your own volume drops when there is nobody to be at a volume for. The corridor at five is slower, you notice the floor, and the person doing the noticing is one the day has no room for.

Stay twenty minutes late once, after a club or practice, and walk the long way out. Pay attention to how you sound to yourself in that state. If you like that person, work out how to get more of the conditions that produce them.