I have a soar on my vagina?

ok, i have aopen soar on my vagina, it is around the pantie line but it is not from my underwear. and it is not a in-grown hair so what is it? it is just a bump that hurts really bad. i don't want to go to the doctor because it is embarrassing and i don't have my "Cherry" but i am still a virgin. so what is it and what can i do to make it go away???