Scientist here. I’ve given hundreds of scientific presentations and I have a fairly severe stutter. I always struggle in first 5ish minutes then usually hit a grove and speak better. Ive also have a wide spectrum of outcomes, from taking 1-5 seconds per word to complete fluency. So you can’t judge yourself by this one experience. Also remember that it’s always better when you think it was. People just generally don’t care. I also agree, when I have upcoming public speaking, it does indeed cause me anxiety, but it used to consume me, and I just kept doing it, and now it’s easier. I expect it to get even easier going forward with my dedication to pursue more speaking opportunities. My advice, do not give up due to this one experience. Swallow your pride and get back up there. It only gets easier the more we do it. It’s one thing to stutter and feel ashamed, but never let your stutter dictate what you do or do not do. If you do it once, before you know it, you’ll be living in regret by letting your stutter win.