Lovely poem ^.^
At first, because of the lines "Never letting go,
Of my sanity,
I know it’s beyond stupid"
I thought it might be Wilhelm confessing his feelings for chaos :p
but then again the lines "I know that I’m not them,
Or anyone worth recognition."
must be from someone not as self-confident as Wilhelm actually seems and it has to be someone able to suspect people to "stab my in the back" this way Kosmos, chaos and many other characters don't fit anymore.
My guess: it's Allen and (of course) he's in love with Shion
"them" could be Kosmos and chaos (because he thinks Shion might be in love with one of them)

...Well, as you can see this poem is pretty much inspirating :D(Sorry if I overdid it)

I really like this poem and when I read it the person that I think of is albedo for some reason.