Also remember that social anxiety and introversion are two different things. Extroverts can have social anxiety too (they want to hang and reach out but doesn't connect).
To be honest, I'm entirely unclear what all these terms mean.
I do know that I've known many people who were overwhelmed with stress and difficulties, and almost all of those difficulties seemed to be caused by other people in their lives (friends, family, neighbours, work colleagues).
Seems as if the main reason one needs social connections and people in your life is in order to have support available to help you cope with the huge problems caused by the other people in your life. Sometimes seems to me to be almost a zero-sum game.