I like it, its not what I would call word perfect as it runs out of steam a little in the end. But I like how you put things, your writing can be very strong in certain areas, but you seemed unsure when you came to the ending. For me it seemed a little tacked on, but I may be wrong.
One or two stanzas though, theres no BS, you go for the jugular and it pays off.
"i used to live
to have my brains screwed out.
my body, used.
my heart absolutely obliterated"
Saying these kind of things in such a raw and natural way, its fight or flight, you take the chance of flopping over your own feelings, but they turned out rather well in the overall context.
The unfortunate thing about this is however:
"and every so often
more likely heartburn
because i'm eating
and now that i'm happy?
If you were to ditch that whole section, this would be a much stronger and more captivating piece of writing, more endearing to the reader afterwards, but you would lose out on whats probably most important for you. So I really dont know which is the best route, perhaps a bit of tweeking?
The Barlow fella is right, you can obviously write and write well, heck i dont even know if your looking for advice!
But for me, this poem in particular has both positive and negative qualities which stick out like sore thumbs, in equal measure.