Interesting poem.
I don't understand this line, though:
Goodbye sorrow,
That I will never have.

And in this line I think you should use liked instead of like:
Goodbye Dursleys,
Though I never even like you

And in both the part about Ron and the one about Hermione you used a variation of the word DEAR. I would change one of them to something else.

These are just suggestions.

I really do like what you are trying to write and the emotions you are trying to show.