The whole poem was great except for the last stanza and expecially the last line of that one.

"On the outside I'm fine
i seem bigger than that
Emotionally, I am
Trapped like a rat... "

Why don't you try something like:

"On the outside I'm fine,
My lips never frown.
Emotionally, I am,
On the verge of crumbling down."

Or:

"On the verge of falling down."

Which ever you prefer.

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(='.'=)
(")-(") Arrivederci!