Sociability - 36
Social Anxiety - 21
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A distinction for me is that while I'm rather uncomfortable in a lot of social settings (especially parties), I don't AVOID them. I just dread them. ;-) I do it despite my underlying anxiety, just because I don't want the anxiety to rule my life.
The public speaking thing - well, I don't think most people, even extroverts, naturally enjoy doing that. Public speakers/presenters who are comfortable doing it are a rare breed.
I had a former job that kinda trained the public speaking/leading skills into me, though. I was a sheep jumping into a pack of wolves.

The job basically called for doing everything I'm not naturally comfortable at doing - giving presentations, leading hikes (leading hikes and guiding and talking to 25+ people for 3 hours!!! EEK!!!) It was terrifying initially, but by the end of the job I was much better and more confident at it, and wasn't nearly as insecure as I was at first. But do I want a job like that ever again? No, I don't.

By the end, while I was outwardly decent at it and got some affirmative feedback, I was still kinda play-acting the whole time, because internally it just wasn't ME, and internally I was on edge and had underlying anxiety the whole time. It was, and will always be, too far out of my comfort zone and natural abilites. But it was cool/interesting to 'test'/challenge myself.