I am 25 years old man. From the childhood I spoke very fast but there had not any speech problem. After completing school certificate I face a new problem and that was in my speech. I was always thinking of that why dumb people can't speak. with the thinking of that suddenly I found that I can't speak to unknown place or senior person except my family members and friends. that was approx. in 1999. now it is 2007. still I have this problem. Sometimes I think that I am dumb. How can i get rid from this problem?