Ok, so I have never had sex in my life. In fact my vagina has never had any "attention". But lately I have had a really bad vaginal rash. No big blisters or anything, just a rash, but then yesterday I found one bump. What could this be? It's impossible for me to have an STD. Really worried...

Do you shave that area? If so it is probably just razor burn!

It could be an yeast infection, if you are itching a lot.
Anyone can have a yeast infection without sexual contact.