I'm a pretty confident guy - still stutter. Doesn't stop me from doing anything, talking to anyone, being engaging at parties etc, but the stutter doesn't go anywhere. Maybe some people have stutters that are easily modified by their moods, like some people have exercise induced asthma that only affects them when they stress their respiratory system. I think its quite clear that some people just have a permanent stutter, like ectopic asthma, that's just always there regardless of your personal context.