Because of the rhyme scheme, I would group the first two and the last four lines together. I don't see any "tercet;" that is, I don't see any three lines that rhyme; your rhyme scheme is AABCCB.
It is difficult to "correct" poetry. Sometimes poets intentionally use nonstandard punctuation.
Your eyes are my sun.
Your smile inspires me, and I hear the sound of fun.
You can't imagine how much I miss
You. I have a feeling that you'll come back soon;
We'll sit and watch the moon,
While my heart screams, desperate, for lack of a kiss.
You have chosen not to use a fixed metrical pattern. You alternate short and long lines. This alternation is nice and gives a sense of pattern or structure. If you don't already know it, you might want to look at the poetry of Gerard Manley Hopkins and "sprung rhythm."
Your first line immediately calls to mind William Shakespeare's famous, and _very_ different poem, his sonnet, "My mistress' eyes are nothing like the sun."