I’m a little different, I’ve always stuttered but through speech therapy and over time I’ve improved my speech and I’m really confident when I’m speaking. There’s are certain situations for me though that my speech really takes a turn for the worse and I don’t know why. Doing recordings or virtual interviews really sucks for me even though the pressure is off, I have the option to redo them, or I can take my time, etc., but I’m so much more confident in my fluency when I can speak to someone in person (including presentations and interviews) I think it’s more a confidence thing rather than like you developing a permanent stutter. I’d say the fear of stuttering and messing up is causing you to mess up. I’m the same way, when I’m comfortable and not thinking about my speech, I’m pretty much fluent. I’d say just accept that when you do presentations and interviews it’s never gonna be flawless, you may have a couple of stutters and misspeaks and that’s not the end of the world. For me, I usually have a bad stutter at the start and after that I either have to put the pressure on and try my hardest not to stutter again or release all that pressure cuz I already messed up and I honestly don’t care anymore, they’re gonna hear me out regardless. 100% of the time, accepting the mistakes will happen results in fewer stutters.