I'm the same and I also dabbled in school musicals back when I was in school. I believe I never stutter when I'm on stage or performing because I've rehearsed so many times. The rehearsal really cements the muscle memory that fails us when we stutter. I review every intake of breath, pause, intonation, etc. to produce a flawless performance. Now I am a corporate trainer and I have some video content up on a few platforms including YouTube. I still rehearse the same way so that my performance is good. I wish I could pause time in every live conversation so I can rehearse my responses 😭