Wow there is a lot of emotion you wrote about here. I am not even sure where to start. I do like how you startout here bbecause you talk about how the monster has hurt you and you reach out to the audience with your sorrow. That's the point I feel you let your feelings flow freely here. I also think this is based on your reality and that in it self makes for a better poem. I like the line "no longer needed in the world".

That line tells me you are depressed for one but it goes deeper than that. I can see this as well you lying in bed maybe your room is the sanctuary from the house you live in. I think that is the way a lot of people feel. Their family is the monsters and everything else seems normal. Everyday I think you write you are letting the light slip away from you and depression in consuming ypu more and more. That is what I feel. And it makes since because a lot of people who get hurt feel that way.

I like the little twist you leave us with. Not really a twist but you bring the "monster" to life. I think it's one of your family members though not sure which one. Overall this is a great poem as you build up the story and you make me want to keep reading. Great flow and story. Well done.