How can I make myself stop masturbating?

I am a girl and I think I am addicted to masturbation. It makes me uncomfortable that I cannot stop. Everything turns me on, including gross stuff and random things. I try to stop, but once I am turned on I want it too badly to control myself and not do it. What should I do? Why am I unable to stop being sexually aroused? Any suggestions or a diagnosis? HELP please! I don't know what to do, but I need to stop!