It's probably a yeast infection. If you've never had one you need to go to your GYN and have them run some tests. DO NOT go to the store and buy a treatment kit until after you get a clear diagnosis from your doctor. If it is something more serious you could make it worse by treating it on your own. Get there ASAP. Yeast infestions can get really nasty and can be a systom of a more serious underlying problem.
Hi,
Sounds like you may have some type of infection. If you cannot see a doctor, Vagisil makes an over the counter screening kit which can indicate if you have a yeast infection, bacterial vaginosis, or something more serious such as an STD in which you would need to see a doctor for. Good luck to you.