I find this question very interesting... Because I really solidly believe that environment is way, way important.
Uhhmm I was very quiet and isolated as a kid, but I can't remember any anxiety because I couldn't comprehend what anxiety was. In general, I was just a quiet kid, in their own world, who didn't have anxiety problems. I was good at talking if people would talk to me first, but I didn't make an effort to start anything. I loved giving school presentations and speeches, and I loved my friends, but I didn't have many, and my mom made all my friends for me lol! What about you Falkor?