However, as lumenwrites hints: I soon relaxed.

It took a while to notice that her head, with headphones on, is in a tiny rectangle at the top right. At first it seems like a disembodied voice.

As athrowaway12 says: slide decks are a relic of the 90s. If you view your talk as "speaking from the slide deck" you've already lost.

Lastly, you can't get there all at once ("there" == being as good as the most captivating public speakers). All you can do starting out is be decent, have the audience not hate you, and get better with practice.