Burn Myself.

This piece has the potential to be really powerful. I liked it, but I think your rhyming scheme is a hindrance more than a help. The first stanza especially has a sins-song quality that doesn't fit the tone. I would try allowing yourself more freedom for word choice.

This poem, with a little work, could be a very confronting, powerful piece. The first stanza is, in my opinion, not benefited by the repetition of the line "I pick a lighter". If you could replace the third line with something else then it would flow more. Also, you refer to a promise but do not elaborate or hint at what it could be about. I would have liked a subtle line that might shed some light on the promise.
I really enjoyed this piece and I do believe it has great potential. Keep writing.