What Causes Pain And Burning Sensation In The Vagina?

I am not sure whats wrong, I am hurting, burning actually, in my vagina. I think maybe it's a uti or yeast infection. I thought it was a kidney stone because it often happens after I urinate and it feels like I have to urinate more but I cannot. But it's been a few days and the pain is still in one place. It's more close to the outer part of my vagina, but it's still inside. But it is my urinary tube, or whatever, that's hurting because it has to do with my urine. Please help! I'm in so much pain!