A lot of teenagers only care about being popular, and will stray from their true selves to achieve popularity. That's why parents always tell their kids "just be yourself," and why kids sometimes respond "it's not a phase, mom, this is who I am."
Even as a kid I always found that a weird one.
Surely it doesn't take that long for people to notice that "who you are" changes with time?
Specially in modern times when you have contact with so many stories.