I think it stems from having anxiety. I used to stutter when I was a kid. I didn’t know how but it went away. Years later, my stutter came back in 4th grade because I just had them moved to a different school so I was having a lot of anxiety. It went away sometimes that year. Fast forward, my stutter came back in my 20s and it lasted for 2 years. Sometimes I didn’t want to leave the house because of it. Went into a depression and was referred to a speech pathologist. However, my speech was fluent whenever I see her because I felt safe. She told me that it’s because of my anxiety. So, I started to build confident and act like I was confident “fake it til you make it kind of thing”. And now I have fluent speech back for about 2 years now. I still stutter on words once in a while when I’m anxious.