Sorry to be annoying about this, but there's really only one thing you can do, and that is talk to a doctor. We know, it seems like it will be awkward, but it really won't be as bad as you think. Doctors hear all sorts of stuff, and they'll help you feel less embarrassed about all of your questions.

If you don't have a gynecologist, your regular doctor should be able to help you, or if you'd like to start seeing a gynecologist (because you've become sexually active, for example), then your doctor probably has some people she can recommend. You can always go to a local health clinic or Planned Parenthood, too. (And don't worry about confidentiality. What happens at the doctor's office stays at the doctor's office.) The problem with trying to diagnose yourself is that you really can't, and left untreated, infections can get worse. Sometimes people mistake STDs for yeast infections, which is one more reason to know for sure. Your doctor will be able to find out what's going on, and if you need it, give you a medication to clear up your infection.

Most likely, it is a yeast infection, which is very common. In fact, an estimated 70% of all women develop a yeast infection at least once in their lifetime. Usually, if you have a yeast infection, you'll feel some itchiness and maybe have redness around your vagina. You may also see thicker discharge than normal (usually white or yellow).

For future reference, there are some ways to help prevent getting another, like making sure you don't hang out in wet clothing (like gym sweats, or a bathing suit). Don't wear super-tight pants or pantyhose, and try to use only 100% cotton underwear. Eating yogurt on a regular basis can help, too, because it promotes "good" bacteria, which combat the yeast.

Seeing a doctor or going to a local health clinic or Planned Parenthood is the best thing you can do. You'll get answers to all your questions, and, best of all, you'll feel better.