Ok so about last well felt this sore in my crotch (I'm a 16 year old female btw) and I didn't do anything about it since I thought it would go away on its own. Now I'm laying in bed and I can't touch it or move without it feeling very painful, especially the top of the sore. I got up and headed for the bathroom to get a better look and the top is very red and some blood is coming out whenever I'd put a piece of tissue paper to it. I'm still a virgin so it can't be an STI/STD right? What is this? Please help!