You are right. I have recently changed my job from factory to office where I speak with strangers every day, run meetings with 1 to 5 people and make phone calls (in the presence of my boss and colleagues). It feels like my stutter slowly disappears. Every day I have fewer and fewer blocks where I cant get a word out, sometimes I even forget that I stutter. When i was about to start this job i was so scared and thought i would block bad, but it wasn't that bad as my fucking imagination thought. I hate the way my brain works and those negative thought about speaking where it should be natural and automatic like walking. Or maybe my silent block have nothing to do with speaking and i only think that i have a problem with speaking. It can be panick attack where i freeze and its obvious that i won;t be able to speak. I don't know. Ive heard about a guy who had silent block and it turned out that it was a fear of saying something that will sound bad. When he wrote a thought on a paper and showed it to the person he was speaking with, the block automatically dissapeard and he could say it. So it was not about speaking. Later he became more confident through socialising with people and the block disappeared. It funny how complex this self defence mechanism is.