Yeast Infection

Hey, So I'm 16, and have a yeast infection. It's pretty embarrassing actually.. but it happens. Can anyone give me and tips or advice.. help anything? I've never had one before and I have no clue how it works. Also I don't want to goto a doctor or tell my parents , I think it's pretty embarrassing. To add to it, I had unprotected sex about 3 days before I figured out it was a yeast infection. Could that be the reason ?