I have to disagree with the premise of your post. At the root of it is the idea that stuttering is something that happens to you. However, that's not the case. Stuttering is a behavior--it is something we do. Therefore, we are able to gain control over stuttering. We can manage (not necessarily eliminate) our stuttering. I do not believe that confidence is a critical part of managing stuttering. There are situations where I am very confident, yet I still stutter. I think many times this idea of confidence is confused with familiarity. It's been demonstrated that people are more likely to stutter on more complex language and when talking about unfamiliar topics. Case in point--last week I was lecturing to the anatomy class I TA on the topic of phonatory physiology (how our vocal folds vibrate). Despite the fact that I am quite confident of my ability to speak in front of a group of undergrads I was stuttering more than typical. This is likely because I'm less familiar with the science of phonatory physiology than say, respiratory physiology. Thus--it was the language I was using and not the situation that was increasing the likelihood of my disfluencies. If I were to give that lecture several times over I would stutter less frequently. Not because of an increase in confidence, but because of increased familiarity with the topic. But I feel for you -- I understand the frustration associated with stuttering. I'd encourage you to change your frame of reference. I don't think you need to stop stuttering in order to be an effective communicator. A stutterer can be an effective communicator despite the presence of stuttering.