Weird thing in my vagina?

okay, this is sortof hard to explain. im a teenager, and as most teenage girls do, they get their period. so yeah everything is fine, and i wear pads and stuff. but theres this thing in my vagina, its like, attached to it, like literally attached, and it blocks the hole. i tried wearing tampons, it got somewhat up, but its never comfortable and i usually take them out right away,a dn when i do it gets stuck on that thing and hurts like crazy. i highly doubt its my hymen, it is pink but it cant possibly be it. its almost the size of 2 cherry seeds, and its pink and weirdly shaped. ive already been to the doctor once because i have vuvloplasty or whatever- but i dont know what this is. NO i have not have sex. help?