Agree with the comments above. My own experience: I had a terrible experience presenting at a law firm many years ago. Almost total block. Now, twenty years later, I’m absolutely confident in those situations. Do I still stutter sometimes? Yes. However I work to exude confidence and conviction. I’m a massive introvert too so, if I can make progress, anyone can. Stick with it. The old cliche about ‘it’s not what happens to us hit the story we tell ourselves about those things’ is true. You’ll find your route. Be formidable!!