Are you going to pull thing every time you're "rubbish" at something? Write a poem about how you don't like writing poems. Make it funny and honest. Give it a try--you might surprise yourself.
I had a little dolly, I dressed it all in green.
I put it in a matchbox and sent it to the Queen.
The Queen took it out, and give a little shout "Hello little dolly, does your mammy know your out.