Maturity

This is one of my first poems ever written. It's what has started my latest and greatest poetry spree.

Why do they expect
Maturity perfect
From me in junior high,
A simple teenage guy?

You're young only once
With not too many months.
You're mature the whole time,
Even past prime!
When in the meantime
You've had not much free time
To act as you are
Not like stiff tar. [some versions say "Not like a star"]

So please hear my plea:
Let me be me,
Mature only part time,
But mainly sublime.