Self confidence is one of the four pillars of career and life success in my Common Sense Success System.  I discuss it in detail in several of my books: Straight Talk for Success; Star Power; I Want You…To Succeed, Your Success GPS and 42 Rules to Jumpstart Your Professional Success.  If you want to become interpersonally competent, you need to do three things: 1) become an optimist; 2) face your fears and act; 3) Surround yourself with positive people.
A while back in a post I did on optimism and self confidence, I mentioned a quote …