I think it's a yeast infection?

Ladies I don't know if you experience this, but prior to my period in a week or so my discharge kinda smells I know tmi. I'm a little to scared to ask anyone simply because ignorance is bliss. 
I am a virgin haven't masturbated, or used a tampon, I'm just 18 year old that plays a lot of sports. If I approach my mom about anything to do with my vagina she instantly thinks I'm having sex
So this is my only option left. Help me!