What to do if I have social anxiety disorder. What can I do to make him think I'm the more bubbly/chatty type?

Be yourself . If you try to be someone different than you are, you will likely become even more anxious. You don't need to be bubbly or chatty to be likeable. Dating tends to be a bit unsettling so even those without social anxiety may be a bit anxious. The more you date, the more comfortable you will become with the process or with a particular man. Visualization and relaxation can both help.