I'm not convinced that ones identity can be described as an introvert or extrovert. Regardless of what I read or what people I trust tell me.
I think you can _feel_ "introverted" or "extroverted" sometimes.
Not a topic that overly bother me, I personally find it hilarious watching people describe themselves with so much confidence. As if they know how the human mind works, and are so capable at it they can perform some meta-analysis looking from outside in.
(If you haven't figured I also think Meyers, Big Five etc etc is all garbage too, "I'm cynical" </joke>)