Do I Know You?

I'm sorry, I thought I knew you,
I didn't mean to stare,
Was that a smile of recognition,
Just before that worried glare?
No, you're right, you're not the person,
The girl I knew was full of hope,
You're depressed and getting older,
You can hardly seem to cope.
She was young and full of energy,
There was nothing she couldn't do,
She had faith and joy and laughter,
No, you're right, she wasn't you.
Promise me, that if you see her,
You'll tell her that I really care,
And I miss her looking back at me,
From that mirror over there.