Do I have VB? I'm a girl by the way?

It could be an irritation to what you are using to masturbate with. Try something else or stop using it for a while and see if it goes away. Now if you are using your fingers then you might have a problem on your hands. If it doesn't go away you should go see a doctor and trust me there is nothing embarrassing about masturbating and I'm pretty sure that whatever doctor you go see have heard and seen way worst than that. Hope everything checks out okay.