When I was younger I used to feel anxious most of the time. The point is, I didn’t realise that it was anxiety. I knew I was “quiet”, but the word “anxious” was never really brought up. Everyone called me “quiet”. Quiet is a very common word and even children know what the word quiet means.
What no one explained however, and what I did not realise at the time, was that “anxiety” can sometimes cause someone to be “quiet”. And “anxious” can be much more of a problem than “quiet” is. “Anxiety” was a complete mystery to me.