Hey, that sounds really hard. I am a speech language pathologist and work in an elementary school. I also stutter. I have been having a really hard time with Zoom as well. There seems to be more pressure on speaking clearly so everyone can hear you and seeing everyone's face looking at you on the screen increases the anxiety, at least for me. I had a meeting the other day, got stuck on a block and couldn't get out of it. I'm an SLP, so I know the tricks for getting out of a block but found it really hard to use them in that moment and just got completely flustered. Communicating over Zoom has a different flow and feeling than in person, and you definitely are the only one struggling or feeling thrown off. If you have any more presentations coming up, I'd recommend talking with your Prof to see if you can record it instead. Feel free to PM me if you need some support.