Your mentality is self-fulfilling. If you think you have a problem and can't get better without professional help, you probably won't get better. Introversion isn't so deeply ingrained in your genetics that it can't be conditioned out of, and I speak from experience.

Your problem right now is that you don't really believe that making a concerted effort, despite how uncomfortable it might feel, is ultimately going to be worth it. (or even work, for that matter) It is.