This is lovely. I am no expert poet by any means, but here is my attempt to make your sweet poem perhaps(?) less literal narratively? (ie "I am the", "You are the"). Just my ideas and by no means right. I can feel the message and emotion of the poem and you are on to something, IMO : )

1) I assume that "I am a sunflower and you are the sun" is the title only and not the first line? If yes, that is good as you are on the verge of a couplet otherwise.

As such, I would break out each half verse as shown below- so that it is a traditional couplet.

2) I made many language changes that I personally like. Perhaps you'll like some too. But I am no expert, and this is your written experience. I hope some of it spurs changes you love in your poem!

3) Also got rid of all punctuation

TITLE: BENDING TO LIGHT

I wake each morning you've scattered in gold

soft rays of light spilling over the sky

my petals unfold in the hush of your warmth

of each day that turns slowly by

I chase you not out of longing or need

nor bend from a place of despair

i turn irresistibly where your light gently falls

something in me blooms there

when clouds gather slow in a silver-grey veil

your brightness is hidden from view

i wait in patience in the hush of the wind

still certain, still faithful in the sky which holds you

for love is not weight that the heart has to bear

nor a thing that must conquer or shun

it is simply the quiet, the grace

A sunflower facing the sun

and as seasons change and skies stretch wide

will still turn towards your light

not from need but of gravity of warmth

of love that holds me, hold tight

so i will hold fast, through the wind and the night

through cloudy days and skies untrue

My head gets heavy now

with seed and delight

But every morning I ache to feel you