Are u sexually active? Had unprotected sex? Any itching or burning? U could have an STD. Go get checked.
Sounds like a yeast infection. They have over the counter creams for that.
What color is it? Most likely culprit is a yeast infection if it is white in color, even cottage cheese like, gross I know. If it is any other color such as green to yellow, it could be an STD, so I would promptly get checked out by your doctor. But it's easier to determine what it is based on color. Good luck and best wishes.
Sara RN