Vagina burning when i use the restroom and don't seem to know why haven't had sex?

Yeast infection: You could be having irritation from a yeast infection that is causing your vulvar tissues to be more sensitive to the acidity of urine than normal. If you've recently taken antibiotics, this is more likely. You may even have vaginal itching. If there is discharge with odor, however, that may be a bacterial infection that needs to be treated with antibiotics. Try otc yeast med like monostat first.