Been stuttering on and off my whole life. I never stutter when I’m alone, with my immediate family, when I’m presenting (even in big crowds-different cadence of speech and enunciating more than usual). It’s so odd, I absolutely never stutter while in a presentation. I stutter when I’m tired, anxious, introducing myself or when beginning a phone conversation. If all these things are happening at once, oh man it’s bad. Sometimes I see the confusion on my coworkers faces when I’m stuttering. Like I didn’t stutter the first 2 years we worked together, what is going on now lol. Everyone is different and of course its 10000% psychological