A person use to be introverted, had a car accident, became extroverted, but want

Question:

A person use to be introverted, had a car accident, became extroverted, but wants to go back to being...?

introverted, in your opinion - Is this possible ?

If so, how do you think the person can go back to being introverted ?
Not shy, or fearful, as how most perceive introverted people are, but much more quiet, a deep thinker, objectively observing and listening, but still semi-friendly.

Any deep insight ? input ?

Best Answer - Chosen by Asker:

people change...i used to be an extrovert...and somehow i changed so all my teachers thought i was getting abused at home or something was wrong...but nothing happened so I don't know y i changed.