Clitoral pain when I move a certain way

Okay, let me tell you, I feel extremely awkward writing this right now. 
So, uh.. I masterbate. Clitorous only, most of the time. And pretty often. So, now when I move a certain way or of pressure on it, there's like a sharp shooting pain going on there. It happens, say, when I pull my pants or underwear up in the front, just full on touch it, and when I make kind of a thrusting kind of thing. I was curious and wanted to see what would happen if I did that, okay?
So, this happened to me once before. I hated it, but I went away after a little less than a week on its own. It really hurts when I happens.
There isn't any abnormal color, no weird colored urine or anything.. The color down there is normal.. So I don't know what's wrong.
Anyone know what it is? You're welcome to ask questions if you want.
This is pretty awkward for me because I'm a bit younger than most people on here and I don't know. I don't want to ask my mother because I'm too shy and she's get mad and embarrass me if she knew I masterbated.
Help? Anything will be appreciated! Thank you!