I read a bit but stopped when I saw Abraham Lincoln described as an extrovert and louder and chattier than other people.

This is one of my blocks writing I feel to vulnerable and exposed

Only if you share it. :) This might make you feel less alone: Everyone feels this way.

Do you want to write? Why?

Here's a book I recommend for anybody that makes stuff and puts it out in the world: "Art & Fear: Observations on the Perils (and Rewards) of Artmaking".

Pfui. Even the use of "introvert" and "extrovert" are simply fashionable alternatives to phrenology.