WHATS THIS YELLOW STUFF???

Alexis

I just got out the shower and I have been noticing that my vagina been bothering me lately so I go down there and take a look. I see this whiteish yellowish stuff near the lip of my vagina and it smells really bad. I’m 15 and I never had sex so I don’t think it could be STD but I’m scared it could be something bad. I’ve been crying for like an hour straight. WHAT IS THIS??? WHAT SHOULD I DO???