Well,
If I knew,
I'd tell you.
I'd tell you about how I'm good at things that'll never matter and
Describe myself in languages that will die.

C'mon, why do you care about me?
You ask 'Who are you?',
But does it matter?
Matter always changes,
Never what it once was.

Even if I knew me today,

I'm not the same tommorrow.

Andrew Phillips

http://www.poemhunter.com/poem/who-am-i-76/