Sonnet Pains

Here's a creative writing assignment I wrote recently. The assignment was to write a Shakespearean sonnet. That means the rhyme scheme is A,B,A,B,C,D,C,D,E,F,E,F,G,G and written in iambic pentameter. I did my best, meaning that it is correct rhyme scheme, and that there are ten syllables per line (five feet), and the themes meant for each quatrain. However, it is not written in correct iambs, meaning stressed-unstressed syllables. This poem is about my frustration in sonnets and in structured poetry, and yet how I feel that the ability to write in structured forms is liberating. There I go, introducing my work again. I should let it speak for itself. Anyway. Here it is, my untitled sonnet.
What was my crime, condemning me to prison?
This dungeon of rhyme, rule, a puzzling beat
The task is heavy, an impossible mission
I frown, bite my pen and tap my feet
Try as I might, these rules are chains
I’m haunted by ghosts of murdered words
Charred ashes of thought fall like the rain
Dragons of the mind, born weak as birds
And yet, this awful riddle draws me near
Enticing me into his deadly embrace
It whispers gently ‘embrace your fear’
Pen to page, my heart and hands race
His dark arms take me, tightly hold me
Somehow this prison, taught me to be free