Worry, anxiety, concern and unsease all come from a basis of fear. It's the underlying fear of a particular outcome, or lack of outcome: Fear of being embarrassed, or fear of failing. You don't have to be in any real danger, but the fear is still there.
The reason for visualisation is not to project how you wish you could be, but give yourself a solid base on which to land in a situation. After you've visualised, give up the visualisation and keep the feeling, the way of being so to speak. When you get into a social situation, concentrate on being that way, rather than trying to have a particular outcome or gain a particular result. If you can inspire yourself with it, it becomes the source of your actions and open up new opportunities, in every moment, even now.
But, in order to access it, first you have to free yourself. The challenge is to enter a social situation and give up all your outcomes, and all your visulisations, all your worries and axieties, so that you can just be free in the conversation. Instead of having a particular goal in mind, just have a conversations for conversation's sake. Talk for the sake of talking, listen for the sake of listening. Have no outcomes, no desires and no concerns. Just be free.