Vaginal troubles

I'm always finding myself scratching various places, I think you know what I'm getting at...
I do it in public all the time and I'm always catching myself doing it without anybody noticing. I was in what I guess you could describe as a "clique", and it was filled with mean girls. They noticed it, and then I guess I was out. I was only fifteen then and now I'm seventeen and STILL catch myself doing it!