I agree. I've had to speak to groups many times during my career and never felt completely comfortable even when there were times I was absolutely certain I knew more about the subject than anyone in the room. Not too many head coaches can do that like Mack Brown, or for that manner Nick Saban. Bud Wilkinson was a master communicator.
I'm the worst public speaker. As a research engineer, I have to present relatively regularly. I've grown more and more accustomed to it, but still suck. Early on in my career, the best way I found was to get drunk the night before and have a hangover. It would slow my brain down to the audience's speed, and also strip me from any care about speaking. I'd be a robot.
The oddest experience I had was early in my career I was thrown onto a sinking project as the lead engineer. It was for the Missile Defense Agency, and they weren't too happy by the output or effort our company was performing on the project. We had weekly and sometimes daily teleconferences, and it was always the same 2 or 3 guys from the MDA on the line, so when they asked us to fly out to Huntsville and present to them, I was thinking no big deal. It'll just be these same 3 guys plus maybe 3 guys from my company and maybe a couple more collaborators.
The first eye opener was walking into the conference room in the morning and noticing the size. Then people started to fill in, and fill in, and fill in, and fill in. The next thing I know there's probably 150 suits packed into this conference room. That was frightening enough, but when I was just starting my presentation, someone quickly interrupted and goes, "Oh, hey, wait a minute. I almost forgot. The Pentagon wants to watch this." And he proceeded to draw up a curtain which revealed a very large screen TV and teleconference camera system.
That was a real moment of FML. It's also the closest to an out-of-body experience I've ever had. I went numb and onto autopilot. I don't even remember presenting. It was like I was watching myself from the corner of the room. I got a lot of kudos from my upper management, but I can't even take credit, because I'm pretty sure I wasn't the one presenting.