Is this An Std? Please Help?

I have this white discharge that kind of looks like cottage cheese. and also sometimes its an off white yellowy color. Ive Never had sex. It doesnt hurt to pee. theres no itching. and theres only a slight Oder. I dont have any idea what it is but its really bothering me. Can you tell me what it is and how i can Make it stop. I ended my period on Sunday. if that matters.