An individual who has been away for a long time will notice that even though you now have a degree, a high-flying job, children of your own etc people who you haven’t met for a long time may not interact with you in a way that is any different to how they did when you were an 18-year-old rebellious goth. Now, of course not everyone has been a rebellious goth - but you get where I'm coming from! It doesn’t matter if you now have a PhD in astrophysics and work for NASA. To them, until you’ve shown otherwise, you will always be that 18-year-old goth. This can be difficult to handle, especially if you already find yourself struggling with a sense of inferiority (see point made above).