After my talks, people often come up to me and say, “I used to be an introvert – but I got over it,” or, “I’m not sure; sometimes I think I’m one thing and sometimes the other. Can you be both?”
Actually, you can be both, changing from one situation to another, or changing over time from one to the other, then sliding back. That’s why I call the introversion-extroversion dimension a sliding scale.
Social psychologists have known for decades that surrounding circumstances can heavily influence personality. Personality tests may claim (or would have you assume) that once you have taken the test and been given a label, you are defined for life. It doesn’t work that way. A personality test cannot necessarily project what you will be in all other situations, past and future.