my sex life

Okay you females know how yall get wet for no reason or moist , you know the discharge in your underwear well my vagina been like dry for 2-3 now ... and i mean completely dry my underwear is dry and when i have sex its dry and I usually get soaking wet .... but no just dry i went to school nd work nd i was dry and while having intercouse it was dry and verrryyy painful .. im not om birth control but i need help.. do i need to try something or do something or is this a disease imm lost