Yes and no. As an anxious person myself, I don't outwardly show many signs of it even though I could be bordering on panic internally. And certain places become "havens" if you will. When I started having panic attacks / anxiety in high school, I would be totally fine on the basketball/volleyball courts but a mess everywhere else. We don't really see Suggs behind the scenes.
I agree with you that he doesn't come across as an anxious guy in what we see, but people tell me I don't either. And they'd be wrong lol.