Window to the Universe

[Magpie]

Hi, it's a big concept that you've taken on here. 
First suggestion would be to consider a title change, the current title is more of a summary of the whole poem. Try a title that adds to the poem.

Why am I here?  -- these first two lines have echoes of the Catholic catechism. Who made me? Why did God make me? 
Intentional? 
What is my purpose
In a universe
So big
Its presence
Forces me to my knees   -- This first stanza is vague and not really necessary in my opinion. The possible catechism allusion and 'forces me to my knees'  could be seen as religious which is not evident in the rest of the poem.
 
I sit in a field,   -- This could be your first stanza
Where the wind  -- you could be more minimal here and cut some words
Murmurs in the grass
And the birds laugh
And the trees applaud, -- birds laughing and trees applauding are abstract images and I think concrete imagery would serve your purpose better for this stanza
All of them
A patient audience
As I question my place
In this world;
They don’t pry
 
After a while
I look up
And the stars cry out in the silent night -- do stars really cry out?
And ask me to listen  -- Think of a way that this can be conveyed in a concrete way. The concept of seeing beauty like the stars and having a moment of self realisation is definite. Do stars however cry out and ask you to listen?
 
They say  -- who? this line adds nothing... ahh the stars, I get it now
The beauty of the universe
Would pass quietly by
Without me.  -- these three lines could be seen as the crux of the poem.
They tell me
That I was one of them
Long ago -- this also is important to the poem. but probably the idea that we were once stardust and not actual stars
 
I see my reflection -- different word choice to reflection 'origins' 'beginnings' ??
In them
As I look up,
My eyes windows -- yeah kind of cliché
Illuminating my heart -- illuminating tying in with stars
With the moon’s light -- the moon is a distraction here considering all the star references
 
And I cry
Because they are right
 
And the heavens
Cry with me
In their own way
 
I think   -- not sure ??
 
But I don’t cry
For too long
And how could I
Because when I look around
The universe takes away
My breath
Once again.

Like I said this is a big concept to take on. More imagery would help to convey your meaning. The 'field' stanza seems the most poetic and a good springboard for more relevant imagery.

Cheers for the read.