The Anthem Lyrics

We need to grow up, we're immature,
that's what everybody tells us, but I'm not so sure.
Conditions in this world today, teenagers are a minority.The Young And The Useless - The Anthem - http://motolyrics.com/the-young-and-the-useless/the-anthem-lyrics.html
You say that we're young and useless.
How can i prove that we're not?