What does it mean when your vaginal discharge suddenly completely stop for days? There's no possibility of menopause, I am 23.

Please clarify. Do you mean your monthly period has stopped? Do you mean it came and stopped early? Different explanation for different situations. If you are expecting a period and didn't get one, I think you know the commonest cause for that.
Menstruation. Periods vary widely from woman to woman. Some periods are punctual, some are unpredictable. See your doctor who may prescribe you oral contraceptives to regulate your menstrual period. Also, do a home pregnancy test.