My vagina hurts badly n burns when itching what could b the problem?

Could be infection. The symptoms you are describing (pain, burning, itching) sound like an infection. You should consider seeing your doctor to determine what type of infection it is and get a prescription for the appropriate antibiotics.
See your doctor. This could be alot of things most commonly is simply yeast or some other infection. That being said, only your physician can say for sure so get seen so you can get on the road to cure.
Vagina burning. Sounds like a 'yeast infection' or uti should get checked.