This poem has a whole lot of painful emotion. You have described a personal journey in such a way that this reader can empathise with you. I like the rhyme and the dark metaphors that paint a dark hell.
The best part for me is the end, the part where the realisation that the true demon is the one inside. This is true in life, until we love ourselves we cannot love another. least of all except it from others.
Well done on this first post. I look forward to reading more from you.