Reading this reminds me of myself a few years ago. This is what helped me. My brother and I were smoking weed one night having a really high type conversation. My brother ask me if I can force myself to stutter on command so I tried it but I couldn’t. That moment I realized when I force myself to stutter I don’t stutter idk why. So knowing that, when I know I am going to stutter I try and force myself to stutter on that word and it always works for me. I still have a stutter but the idea knowing I have somewhat control over it gives me the confidence boost I need to move on in life.