Really painful vagina

I'm 13, never had sex and not currently on my period. But my vagina really hurts. Not on the inside but the outside, particularly the back part of it. I do not want to go to a doctor because I am really uncomfortable with anyone looking down there. If it goes on I will tell my mum but are there any home remedies or something I can do? Because it's waking me up in the night. It's currently 3:30 but have been up since 2. Please help!