I am dead at all of you not being able to understand what he meant

he means that Justin is having an existencial crisis, fame got him, he is not comparing Justin to MJ in that context of being a legend, sorry but you are fools.
Basically Justin lost part of his childhood and teen years doing things that normal kids don't do, he was touring, recording and travelling from one country to another basically what MJ did and then he was depressed because he never experienced those little things that's why he wanted to be like Peter Pan and tried to emulate him, because MJ never had a childhood.That's it MJ himself told that and Scooter I remember once told that Justin himself told him, never allow me to that happens to me, but it turned out wrong.