I agree that social anxiety and introversion often get conflated. Another component of introversion I have found for myself seems to be physiological. I have al

I agree that social anxiety and introversion often get conflated. Another component of introversion I have found for myself seems to be physiological. I have always considered myself fairly introverted and have also had a fair amount of social anxiety. In my younger years I largely isolated myself for large periods of time. At one point I started taking a vitamin B supplement to attempt to treat some RSI nerve issues. It didn't seem to impact what I was trying to treat, but I began to crave social interaction which was challenging for me because nothing in my life was structured to provide me with social interaction and I still had enough social anxiety that I did not even consider seeking out interaction more directly (like going to a bar and chatting with people). The craving of social interaction went away after I stopped taking the vitamin B supplement. I experimented on and off with the vitamin B, but it eventually led to me having severe insomnia when taking it so I had to stop. I have noticed a similar but milder response to supplementing vitamin D (both feeling more social as well as insomnia).