Your body could be making extra amounts of a hormone called prolactin, which can cause a white discharge from your nipples. It doesn’t have an odor.
Occasionally teen girls have a milky breast discharge called galactorrhea, pronounced “gah-lack-toe-ree-ah”, which looks like milk. This can result from taking certain medications, such as medicine for mood problems and rarely from birth control pills; from being pregnant or recently being pregnant; from low thyroid hormone levels, or rarely from a small benign (not cancerous) tumor in the pituitary gland.
You should see your health care provider to determine the cause of discharge.