Thanks @trangbaby for letting me know this interesting topic.
In our life, we have so many first times
I remember vividly the first time I did a public speaking presentation at university. When I was a freshman, I had a fear of speaking in public.
My major was English at school, that means I did a lot of talks, presentations. I was so nervous 😒at all the time, how to make eye-contact with others, how to use body language and avoid staring at the screen.

My first presentation was "Marketing research about a product". I was very well-prepared for every slide of PowerPoint, designing banner, visit cards, ...
I felt very anxious and depressed about the day after when I spoke in front of large groups of people. 😌 My heart beated very fast, my face turned into red,..
Fortunately, my presentation was so successful even though it was not completely perfect.
Until now, I must say that I'm totally confident when talking in public.😋😋
I think a fear of public speaking is a common phobia with many people like me.