My boss said I need self-confidence and energy?:

My boss said I need self-confidence and energy?

I suffer from social anxiety, so working is pretty hard for me. My boss knows I’m “shy” and said that all I need is some self-confidence. But I don’t know how to do that? I really try to be outgoing like the rest of the people I work with, but I just can’t. Any tips? I go back to work on Friday, so I really want to go in there like I’m a totally different person.