From what I’ve experienced in my life every stutter is different. Like mine is only on certain words for the most part. I can’t say “Seven” to save my life. I even asked for a phone number without them in it to save me from future struggles. I also stutter more on words that start with “L” more than anything. The only thing I can think of is I don’t stutter when I whisper and sing, and the two use a different breathing technique than regular talking.