PLEASE HELP but its tmi

So i have one white bump almost inside my vagina like under my vulva. It doesnt hurt but i have never had sex nor any sexual contact down there. Im 15 and im embarassed to tell me mom because idk what to say but i wanna see a gyno about this because if had it for over a month and it hasnt gone away. Have any of you guys experinced this?? Idk what it is