Who you were in high school was one season of the show. It gets renewed with a new cast.

Who you were at sixteen was a character written under conditions you did not choose, in a building you could not leave, surrounded by the same three hundred people. None of those conditions are permanent, and neither is the person they produced. The role ended when the setting did.

If you still introduce yourself with descriptions assigned to you back then, test whether they are currently true. Quiet, bad at this, not the sort of person who. Some of those were accurate once and are simply out of date now.