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First of all, I enjoyed the rhythm of it. Generally, there are ten syllables in each line, though sometimes it drops to nine or goes up to eleven. I don't think this was a mistake, as when you wrote

'cause to live my life is my mission

It was as if you'd deliberately cut the 'because' to make it shorter.
Next, I liked the rhymes and how you didn't title it; I don't think that naming it would have added to it, somehow, as the text is so . . . Intriguingly sad that a title would have been irrelevant. I also like how you've capitalized the beginning of each sentence, as in forms like this it doesn't need to look delicate. This poem is almost bitterly hard, and wouldn't need the gentler edge that small letters give.
I might be wrong, but it's like you're escaping from a bad place in this, whether mentally or physically. The final line sort of confirmed it in my mind, as in ' you're NOW going to find the sun', if I'm making sense :)
I couldn't make out all of the emotions in this. In some ways, it's uplifting, telling those you leave behind not to worry, you're going to be happier. But in others, it's bitterly sad that you have to go and find somewhere happy in the first place, and that you have to leave to find it.
Personally, I think some places might need a full stop or comma, but it works either way :)
Enjoyably interesting write