I loved this. The flow was good and I love the rhyme. The entire thing was well organized to me it seems.
Yet, its message is so tragic. Which is another thing I love. It seems that you poured your heart into this one and it shows. It is easy to relate to. Great job at getting the message across.
My favorite part would be the last stanza. It really speaks to me.. And it makes a connection between the knife and the veins.