I actually was the opposite. I was extremely shy, neurotically so. One of my first childhood memories is that of hiding behind the dryer in the dark in the back room with the door shut, when friends of my parents showed up to visit. I think I was four. They didn't know where I was and had to come find me.
When I was in fourth grade, I was supposed to go to summer camp for a week, and I never ended up staying -- I cried non-stop in the registration line, probably 45 minutes altogether, until my parents gave up and took me home. I had a chance to stay with my aunt and uncle a state over the next year, I would have been with four cousins I rarely got to see + a swimming pool, but again I fell to pieces. (However, that summer, I did decide to brave out summer camp, and after the first two days, I kind of enjoyed it... although I still spent a lot of time alone.)
I never really got talking until I went to college and I met people who I felt understood me... and as my self-confidence improved over the years, my social abilities and interests have increased accordingly. At this point, I actually really like engaging people of all different sorts, to the point where online I know I've been accused of being extroverted by some. I don't think anyone would guess how I started out. I do consider myself introverted because I still do control what I show and even engagements I enjoy exhaust my energy reserves, and I need to be alone to recharge and get my focus back and feel centered again.
So I don't think Introversion necessarily means "untalkative" or "avoids people." In fact, I think the MBTI Step II and III's sub-categories break Introversion down into different areas, to distinguish this. (You can still be classed as Introverted, while still enjoying connection and being engaging.) Like I said above, a lot of it for me was fear -- fear of strangers, fear of me making a mistake that would bring reprisal or rejection and close opportunities. If I was with someone who I did not have a natural rapport with, I wanted to know the "rules" so that I could act appropriately and keep things working. Once I acquired enough experience and learned I could trust my communication skills, a lot of the fear dwindled.. although even now if I'm in a new situation with people I don't know well, I can be reclusive and vanish quickly. (Now it's more of a choice to leave after "putting in my time," though, rather than a compulsion to flee.)
It does?I got a lot of rejection from adults because they thought my desire to discuss/inform them of these types of topics was weird in the extreme (how can you not want to talk about whether Europa really has water ocean underneath its surface?).
No, they want to discuss the weather and what their kids are doing next week and how gas has gone up lately.