We need to understand what prevents your person from being confident. Did you hesitate inability to eloquently express your thoughts? And if you think, is this a disadvantage? All people are really different both internally and externally, each have their own talents. It does not really important if you do not know exactly how to fight on the felling persuasive speech, perhaps, your calm and silence - these are signs of a deep creative nature. Indeed, at times, a long eloquent monologue can be very little sense.