You know that you are growing up
When you realize that

"Be strong"
Really means,
"Don't bother me with your problems"

"It will be okay"
Really means,
"It will never be okay, but just tell yourself otherwise"

"I'm sure no one noticed"
Really means,
"Everyone noticed, but was too nice to mention it"

And that
"No one likes you"
Really means,
"Just leave us alone, nerd"

"You are so stupid"
Really means,
"You will never fit in"

And finally,
"Why are you even here?"
Really means,
"Just go **** yourself already."