It could be a yeast infection. I've had many. You don't have to be sexually active to develop one. Keep the area clean and dry. You could also try a feminine wash, but be careful if the infection seems worse, you don't want to irritate it further.
If it continues I'd see a doctor, they're really easy to treat and doctors see it all of the time! Nothing to be self-conscious about. :)
Clean the whole thing nice ly with some antiseptic and see.