I remember a presentation I did in high school. I was absolutely bricking it. Had to do it. No choice. This was about 30+ years ago. I got up. Did my presentation on boxing. One of the few times I controlled my stammer, and I got a grade 1 (highest). Class even gave me a round of applause. I hid my face in my hands in sheet delight and embarrassment. It's a horrible feeling, but it can prove to be a positive experience.