Writers block

I need some help,
I have writers block,
Nothing i write rhymes,
And I'm against the clock.

I need a poem for an English exam,
Tomorrows when its in,
But it seems that everything i write,
Always ends up in the bin.

Grr! what am i gonna do!!
This is taking the p**s!
OMG! Ive realized I'm rhyming!
Hey, I'm good at this!