Why does my vagina hurt?

Okay so three days ago this started, all day it feels like my underwear is shoving up my vagina like a tampon half-in and the right-side skin of it is sticking to the underwear (not sticky, just sticking to it) and when I went to the bathroom to try to fix it my underwear is fine? Also, when I walk around with... show more Okay so three days ago this started, all day it feels like my underwear is shoving up my vagina like a tampon half-in and the right-side skin of it is sticking to the underwear (not sticky, just sticking to it) and when I went to the bathroom to try to fix it my underwear is fine? Also, when I walk around with regular underwear or none at all, or when I pee, it hurts. It feels like theres a grain of sand or something thats rubbing against it hard and it hurts. Why is this happening/ what is it?

I am a virgin and in High School.
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