Please help me, can I wash my hair in the high school dormitory (there is no separate bathroom in the dormitory)

. . . . As an old driver in the dormitory, the swimming pool in our dormitory is quite good. In summer, I bend down and turn on the tap to wash my hair, and then wash it. It was really cold for the first time, but it didn't matter later. The main thing is that I'm really nervous about studying. It's good to wash your hair Don't fantasize about how good the dormitory is. Every day is exactly the same. I can't talk after lights out. Anyway, the time for shampooing is very crowded.