Exactly sounds like a yeast infection to me although you haven't have the most tipical symptom"itching".
Women with yeast infection may develop any one or all these symptoms including:
Pain/itch/burning at vulva area
Pain/itch/burning in vagina
Pain during intercourse and/or urination
Cottage cheese like vaginal discharge
Swelling and pain around the vulva
You can try to eat lots of plain yogurt or put it directly on your privates. I suggest you to see a doctor and get it tested. Yeast infection is not always caused by sex, virgins may also possible get one. If you do have one, you'll get prescriptions. Herbal medicine called SPAM could also be a good option since herbs are more natural and can always get infection treated more completly but without carrying drug resistence and side effects. You could google it and have a look.