“Do I have an STD?”

There are many different causes of vaginal burning, including irritants, sexually transmitted diseases, and menopause (last one is ruled out). Each cause has its own symptoms and forms of treatment. Don't jump to conclusions and go to a clinic and get tested properly. Too many women are embarrassed that they could have gotten something and don't get treated. Not being treated is by far the worst thing you can do to your body. In the meantime, don't have sex with anybody else and stay away from perfumes and dyes in your washing habits and buy a "clean" detergent and stay away from fabric softeners for your underwear.

It is a possibility, but would not be able to confirm unless you get tested.

It may be some type of vaginitis & can be checked by your physician. The symptoms are not necessarily from an STD. I would suggest seeing your physician to be sure.

I suggest getting evaluated by a gynecologist. This is not medical advice.