You’ll never do it, not a chance
I can see you’re useless at a glance
You haven’t got the skills you need
The craft, the poise, the will, the speed
...
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Hmm, this was interesting. I'm a little confused, though: are there two voices in the poem? If there are, could the first be your own self-doubt, perhaps, and the last be another person who believes in you? Or maybe there is just one voice, which is yours, I guess, and it shows how you believe in yourself deep down, but push yourself to improve by disbelieving. Good job, anyway.
Could be either... or both... or neither. I see it as one person throughout, could be inner voice or just an annoying friend 8)