Do i have a yeast infection?

For the last few days i have been having a lot of pain in that area and it has been really itchy. today it has been less sever then it has been in the last 2 days but i started looking into it and i have everything but the discharge. i am only 17 and it was saying htat yeast infections usually dont happen till after menopause... so that cant be me. i just need some help on what there is that i can do to help.