As someone who got into that mindset very young and kept it well into adulthood, I'd say the most important thing is to realize there is no such age. You're never too old to consider changing your ways. You can always find the courage to build a new core identity, not instantly but as a process. Trust yourself to be able to do that, know that new uniquenesses will replace the ones you give up.
And also, pick who you socialize with carefully.
True, but it gets harder with time. Most people solidify their outlook with age, and once you've defended something fiercely for a time, it takes a lot of courage to take it apart and put it under a microscope. I'm trying to be more nuanced in my approach to things now (not SA related) and it's like pulling teeth.
Leonard Cohen (Bird on a Wire): I have tried in my own way to be free
Mrs Hudson (BBC Sherlock): Sherlock! The mess you've made!