Introvert or Extravert?

Carl Jung had a lot of observations on the subject, which  Dr. Stephen Diamond talks about here:

http://www.psychologytoday.com/blog/evil-deeds/201205/essential-secrets-psychotherapy-jungs-typology-eudaemonology-and-the-elusive-

If you're a musician, especially a songwriter/composer, or an artist or writer, there's a good chance you have wrestled with your own typology. A lot of us are naturally more introverts, but to make a living at what we love to do, we must try to adapt the behavior of an extravert. It can feel like being emotionally strangled at worst, on a good day it can just feel like being on the "wrong" path. It's a double-bind. But it helps, me personally anyway, to know what the underlying cause of the "suffering artist" condition might be from.

Narcissism vs. BPD

I've received a lot of email asking about Narcissistic Personality Disorder, and the difference between that and Emotional Dysregulation or Borderline Personality Disorder.
Randi Kreger,  the co-author of Stop Walking On Eggshells, has written a 10 part series Blog on the subject, clearly written, easy to read and to the point.
You can find it here:
http://www.psychologytoday.com/blog/stop-walking-eggshells/201110/what-have-you-done-me-lately-entitlement-key-narcissistic-trait

• I have the perfect right to do or say whatever I want and no one should object.
• My needs have priority, and if others don't like it they just don't understand my superiority.
• If you don't do what I want I will become highly offended, make threats, plead with you, or criticize and blame you. If that upsets you, that's your fault. And please don't bother me with your feelings about it. It upsets me when you don't see yourself as inferior to me.
• Relationships aren't about give and take. They are about me taking and you giving. If you give and give with the hope that you will one day get your needs met, I will string you along as long as I can.