I think most people experiencing that. And like anything, you can improve it with practice. One of the best training classes I took at work was a class on using a mind map to structure a presentation, then practice by recording myself giving it. Playing back the recording and watching it was eye opening. I always thought I was a bad public speaker because it felt like I a was inserting lots of pauses, “Um..” and other stuff like that. After watching the recording it turns out a lot of that filler stuff was in my head - I never really said it! Our brains are amazing; still learning how to live with mine after 50 years!