Ok here's one that's pretty deep so your teacher should like it:
I look into the mirror,
But do not recognize who I see.
I look into the mirror and think
"That is not me."
I stare into my eyes,
Cold, grey and empty,
That is not me.
I look to my mouth,
Perfectly formed and shaped,
Colored in red,
That is not me.
I search for my now invisible freckles,
Hiding beneath layers of an unnatural substance.
That is not me.
I stare at my reflection,
Myself,
Shocked at what I see.
I now wear low-cut dresses,
Designer necklaces,
And make-up.
"This cannot me."