What has started helping me recently is taking a deep breath, holding it, and as I’m exhaling I say what I want to say. Words I would normally stutter on seem to just flow a lot better. It almost sounds psychological for you right now too. Seeing the red light blinking you probably think “people are going to see this later” and it makes you nervous. I’m the same way. I have to use the intercom at work where 300+ people will hear me. I say what I need to say multiple times before actually getting on the intercom and it seems fine, but then I press the intercom button and the nerves set in and I stutter and have to cancel and try again. That’s where the holding my breath thing helped me. If you try this, speak as slowly as you need to and focus on the words and your goal but don’t stress yourself too much. Find your comfort zone. I believe you in you