I think i might have bacterial vaginosis?

hi im 13 and for the past 3 days my vagina (not the lips of it) has been hurting and itching but mostly burning. i know its not a yeast infection because i looked it up online just now and i stumbled upon bacterial vaginosis. i havent started my period but my discharge isnt clear, its yellow. it smells, sometimes when i sit on my bed sitting criss cross i can smell it faintly. im very scared and dont know what to do. i know i need to tell my mom. i was with my dad when it started but now im back at my moms house and i dont know how to tell her. i need to tell her as soon as i can because i can barely type this right now. my step dad is in the room with her and i dont know if he is working tomorrow (he's a police officer so his schedual is wierd) my mom is always out going to stores and stuff. i want to tell her tonight but i really dont know how. please tell me!