To use the technical term for it, thinking that poetry can't be measured, guiding the creativity, gives a shape to creativity, etc. is bullshit.
Look, poetry isn't mystic mastication. It's a form of composition which requires sticking to rules and regulations--even in free verse.
Haiku, for instance, involves 3 lines of five syllables, 7syllables, and 5 again. They could rhyme or not. What haiku is like in Japanese, I don't know. But those are the simple rules in English haiku. If you don't follow those rules, then it isn't haiku.
If you are writing a poem in heroic couplets, it must be in iambic pentamer, and the couplets have to rhyme. Those are the rules for that style.
Of course you don't have to write that way. You could write like Bob Dylan -- I certainly would if I were very, very talented.
Subterranean Homesick Blues
Bob Dylan
Johnny's in the basement
Mixing up the medicine
I'm on the pavement
Thinking about the government
The man in the trench coat
Badge out, laid off
Says he's got a bad cough
Wants to get it paid off
and so on. There is a meter and a rhyme scheme. The grammar is pretty straightforward.
My guess is that Dylan didn't just dash those lines off, stand up, and sing them. The stuff of his that I am familiar with look polished--meaning, worked on a lot.
If you want to write poetry, start with straightforward grammar. Learn how to maintain a beat of emphasized syllables, and how to rhyme. Try, at least. Go on from there. Learn something about the basic forms.
I don't know whether you have a creative bone in your body or not. There is nothing about poetry (or anything else) that makes one creative. Creativity is mostly the result of striving to achieve beauty, and is mostly hard work.
Here's a sample of heroic couplet verse by Alexander Pope:
Together let us beat this ample field,
Try what the open, what the covert yield;
The latent tracts, the giddy heights explore
Of all who blindly creep, or sightless soar;
Eye Nature's walks, shoot folly as it flies,
And catch the manners living as they rise;
Laugh where we must, be candid where we can;
But vindicate the ways of God to man.
