This might be a load of nonsense, but here's what I think. I think that the SA has prevented us from experiencing some of the best things in life, from becoming outgoing people, and now we just have a gap that we must fill.
I don't know about that, because I've only had major anxiety for a couple years and it's only gotten so bad that I don't leave my house this year. I lived a very full and exciting life and was always very outgoing. I spent from 17 until 25 traveling the country, hitchhiking and riding trains, joined a circus and lived in a bus, lived in many different cities and met tons of people! Inside, I always felt a bit anxious, I was always trying to be and do whatever I though would make the people around me accept and like me, but that didn't really stop me from doing what I wanted. It just made my crazy experiences less fun, because I was always worried, always feeling like I wasn't really fitting in or like the people I called my friends didn't really like me. Yet I still feel like I'm 17, I still feel like a kid. I don't know what's up with that, maybe I still feel so much of the same fear, anxiety and insecurity that goes along with being a teen and that's why I still feel 17. Maybe somehow it feels like being an "adult" means being confident and having a certain amount of surety about your choices and who you are, and my lack of that is why I feel like I'm still a kid.