Right, first off, I've not met many people that can express as much emotion, feeling, and meaning in only 36 lines. I especially love the metaphor of the four walls as a prison, devoid of anything, pressing in upon the narrator, and the way the narrator is both "...my own enemy to my(self)..." and "...my own victim to myself...". In terms of flow, I have two things:

Firstly, I think that you are limited by the rhyme you seem to force yourself to keep to. I think you need to learn that not all poetry has to rhyme, but that the flow is the thing that matters. To me, poetry is like Jazz: it breaks all of the rules other types of composition created. That can mean anything from breaking sentence structure to eliminating punctuation. Choose wisely, but make sure that the flow of original thoughts coming from your head is never allowed to be limited.

Secondly, when you do rhyme, because some poetry just has to rhyme, you should be increasingly imaginative with it. Also, don't let anything stand in the way of the flow and rhythm of the composition. I'm not well practised with writing poetry, but I write and play music and I feel poems, especially the beat of the words. Keep the rhythm going. Even sing it, or chant it, just to get the flow of the words right. Because, in some places here, you've seemed to lose the flow a bit just to make it rhyme.

Punctuation. Is. A. Fantastic. Tool. To. Use. I noticed that you were sparing on the punctuation, but I think that this only added to this poem, given the style of this type. However, use a couple of full stops. For me, seeing as I follow punctuation like a roadmap, not seeing a single full stop was like racing uncontrollably towards the brink of certain destruction. Full stops slow down the writing heaps, and you seem like you need to slam on the brakes every so often. Just a suggestion, so please don't take this the wrong way.

Content was brilliant. You've captured your thoughts clearly, and aside from the limitations and barriers you put around yourself, it was unequivocally amazing.

Just one last thought: I think that whenever we see the thoughts of others, we see what we wish to see. Whether it is drawn, written, or otherwise created, we will only see what we want to see, unless we can push down the barriers separating ourselves from the narrator/author, and communicate on an emotional level with them. You have this ability to communicate at this level, and I can draw so many parallels from this work of art, not only from my life, but from the lives of many of my friends. Not everyone has that talent.

Write from your heart.

I'll be blunt. It's nothing new. People with depression, suicidal thoughts/fantasies, or all of the above in the lexicon of mental disorder or social abuse write about this most, if not all, of the time. You borrow anatomical and environmental images effectively (your four walls, corners, and single floor, as well as the demons escaping with the burns to your flesh). I tried to translate your poem in a comment, as best I could. Overall, its strength is in its honesty, one of which I can attest and identify with in more ways than one. Good on you; keep going.