i get what message you're conveying and it's a very nice poem but the grammar could use some work. You've started the poem using past tense yet the second line is in present tense. and in the last line you've used you whereas you've referred to the girl as she / her the whole time. other than the grammar its great, i loved it.
She was my sunshine, while I was just a hue,
I found solace in her presence ,Happiness in her arms
I could spend my days with just the thought of her while
She could go on her day without a single thought of me
I guess not being loved by her is my sin for not loving someone who loved me