How do I get rid of my shyness?

Being overly shy is okay for a girl your age. I believe it is an evolutionary defense mechanism in the youngsters to protect them from the older more malicious people.

Don't worry aout your shyness, as it will dwindle by the time; worry about getting your shyness used by some people like for example: A vendor who wouldn't give back the change after u bought something from him because he/she proclaimed that he/she had a poor family to feed. In such case he/she is going after your shyness so you would not ask for the remainder of your money