If you have never been sexually active (meaning no vaginal, oral or anal sex) it is not possible to have an STD. Vaginal burning/itching in this case can be due to other common causes including yeast infections or bacterial vaginosis (due to an overgrowth of normal bacteria in the vagina), which are NOT sexually transmitted. If you have burning when you urinate, are urinating a lot more than normal, feel like you need to urinate all the time, or have foul-smelling urine, you may have a urinary tract infection, which is very common in women. If you have any of these symptoms, please see your OBGYN for a checkup and possible treatment.
Jahan Jadauji, M.D.