I believe that you can change to be whatever you want to be. Shyness is simply a belief that limits the way you interact with other people. Introversion, insecurity, low self-esteem. These are simply aspects of this belief. Well, here's the news.
Nothing is set in stone.
If you believe that you are shy, then that belief will effect the way you behave and treat other people. You can change your behavior so that shyness no longer limits your behavior. You still believe that you are shy, but when you recognize it you don't let it effect your chosen behavior. OR you can decide to free yourself totally from shyness. Decide that in fact that you are not shy at all.