What works for me is two things. First, practice your presentation out loud. Not just in your head but out loud. The more I got used to saying something then the easier it was to say it in front of people. And two, don’t worry about the time being up there presenting. Easier said than done of course but still. Every presentation I’ve done has been a moment in time and those pass. Hell it feels like it was a month ago that everything was locked down in 2020 and here we are a couple weeks from 2022. Your presentation will be here and gone before you know it so don’t worry about that but instead go enjoy yourself doing whatever it is you find enjoyable.