I love this poem. God is good isn't he.
It helps the flow of your poem if you have it more like this:
Once I was trapped in the prison of my own dark heart,
I didnt know where to start,
~anne~

This was good but I wish you would have expressed more about how you fallen astay I think that would bring this poem out more but good job...

excellent

Very nice poem. Short but sweet. Keep writing, my dear!

-Ice

make breaks in between like
"Once I was trapped in the prison of my own dark heart,
I didnt know where to start
or how to begin to explain
all of the pain." or something like that have a good day