I have the same thing. When I worked retail I once met another stutterer. He was asking for something in the store and I felt really anxious, didn't know what to do really at that moment. I wanted to get out of the situation quickly. I've never thought that this is how others perceive me though. Might be, might not be. I wish I knew someone who stuttered, like closely knew them, because sometimes I just want someone to understand and conversate with about the immense anxiety that comes with it. It can't be explained all that well I've found. Only one that seems to come close to understanding it is my brother.