I can't write poetry.

My english teacher gave us the assignment of composing a sonnet. This is what i came up with....

So here I sit with paper and with pen
Imagining the words I want to say.
Enchained by lines of syllables of ten,
Rebellious, my mind longs to break away.
Unable to express my heart's intent,
I heave a sigh as I begin to cry.
Frustration quickly turns into contempt;
I must wait for these emotions to die.
Just as the old proverb of patience states,
I must not give up on this sonnet yet.
Remembering how well patience placates
I shall forbear and not become upset.
For in due time the words will come to me,
Then all the world shall read my poetry.


i do wish i was better acquainted with the ways of writing poetry.......