When I have my period, my deskmate always asks me what to do.

Is your deskmate a boy or a girl? If it is normal for a girl, she may be afraid to say that she has been here. I want to ask if you have come. If you come, she will feel relaxed. She is not the only abnormal person, because for a developing little girl, coming to menstruation too early will make her feel shy and afraid of being known, so she thinks it is a joke. So I tentatively asked if you had come. Maybe just to find a kind of inner peace. It was a girl who told me.