Build evidence stronger than the story you inherited about yourself.

Most people carry a description of themselves that they did not write. It came from a family, a classroom, a season that went badly, and it has been repeated long enough to feel like a diagnosis rather than an opinion. Arguing with it rarely works, because the story is older than the argument. What does work is accumulation, because a record of what you actually did is heavier than a sentence somebody said about you.

Pick one claim in that inherited story and start collecting counterevidence in small, dull, repeatable ways. Keep a note of what you finish. Over a few weeks the file gets thick enough that the old line stops sounding like fact.