What to do if i am 17 and not sexually active. i have had extreme itching and irritation in my vulva area.?

Vulvitis: It could be a couple of things like irritation from your soap, but probably the most common issue would be a yeast infection. You can try some over the counter medication like Monistat or gynelotrimin (clotrimazole) (you can just use it on the outside) or see your physician for an evaluation. Swim suit season does mean increased yeast for some women