Do something unexpected, Scan yourself, pretend that you are already positive and bold, willing to express and share your own feelings. if you are not comfortable to do certain things, you must say "no,i cant !" Try to be optimistic too ...
I agree. And bold has a broad meaning. You can be bold in different ways. Being bold with your looks, how you speak and how you carry yourself. The important thing that you should know about being bold is that you should have the confidence in order to be bold.