My discharge is yellowish brown and smells unpleasant. i am not sexually active and i am a teen. what do i do?

See your doctor: Your family doctor or an ob/gyn will be able to give you advice about hygiene and help treat your condition. It is most likely either a yeast infection or a bacterial infection called bacterial vaginosis or gardinerella, or a combination of these. Both of them can be treated easily. They both represent an imbalance of bacteria and yeast in your system. The doctor will be able to guide you.