the prefix is "in" because the opposite of introvert is extrovert, where "in" is replaced by "ex"
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That is the correct spelling of the noun "introvert" (one who remains private or alone).
The adjective related to the noun introvert is introverted. The negative may be unintroverted or nonintroverted.
Why would you want to? Your personality is who you are and there are several advantages of being a introvert rather then a extro.
an introvert
Here are a few examples: "John, clearly the introvert of the group, wasn't very comfortable voicing his opinions during the meeting." "Undoubtedly an introvert, Einstein spent a good deal of time in solitude developing theories that would change physics forever." "Jim, ever expressive and eager to interact, was frustrated to be at the party with such a quiet and reserved introvert like Bill, whom he saw as something of a 'drag'."