Vaginal dryness is very common and frequently appears during menopause. However, it's not a problem exclusive to menopausal women and vaginal dryness can affect you as early as your 20s.
Normally, glands in your cervix produce a natural lubricant that keeps the vagina moist. This can change for a variety of reasons like dehydration or stress, and medication like oral contraception and antihistamines. In particular, your vagina changes during menopause, when oestrogen levels in your body naturally decrease and you may experience vaginal dryness due to reduced natural lubrication.