Without being unkind, and in the realisation that your personnal suffering is quite real, can I suggest that as poetry this is pretty boring, I have read pretty much the same thing thousands of times. The feelings are not uncommon, and while that doesn't make them less painful for you it should make you realise that if you wish to put them into a poem that others are going to read, and if the poem is going to be a success then you have to offer something that the 100,000 or so people who have already written this same poem, in different but uninspiring ways had to offer. There is more to good poetry than putting your feelings on paper with a set of line-breaks. Some other conventional punctuation would help also.

There's nothing wrong with wanting to put your own feelings/emotions into a poem, but for me particularly a poem is far more appealing without repeated use of 'I/me/my' etc. See if you can find a way of writing this that isn't in the first person - maybe try writing it from the mirror's point of view. Alternatively, my favourite trick is to invent a new point of view - something else in the room watching you, for instance. It just makes it more intriguing for the reader - and also allows for a bit more innovation.

I like the idea of smashing reflections--maybe focus it more there, other things to smash/avoid, don't tell us so obviously about the self-loathing, let the images carry it. Easy way to tell if you're telling too much is to count the "I"s and "my"s. You've got a lot of 'em. :) Good start.