I guess many people still have that fear, fear to be in a crowd and to mingle with other people. I know for the fact that "no one is an island and no one stands alone" and you must simply accept that.

Socialization really is a big factor in order for an individual to grow and to be matured in some aspect of their life. I know some introverted person who tends to regain their confidence and overcome their fear of being with people through joining singing competition, engaging to sports, being active in church and joining non government agencies to help those in need. These activities will somehow develop their speaking skills and builds up their confidence as well.

Life is too short for you not to enjoy it. I'm also an introverted person before but I did not let that fear to eat my whole being. I find a way to outgrew from it with the help and support of my family.