It's definately different than what I thought it was going to be. I'm always used to reading these cutter poems and this was a change from that. Kind of makes you think that you can take yourself out of this world so easily, and leave everyone behind you with a letter. Typical ending for a suicide, but I still like how you wrote it:)
You are clearly a good writer - this poem has nice flow and a fitting rhyme scheme. However, I think you are simply working with far too clichéd of a subject. It's too 'teen angst' and even with brilliant language, it won't be set apart from the crowd of hateful suicide poems that everyone wrote as a teenager. Keep working, and think about what you really care about. What makes you unique as an individual? Write about that and you can have well-written AND original poetry.