Deader Than Dead

I'm trapped
inside a 6 walls room
With no windows and no door
I can't tell which is the ceiling
And which is the floor
There are no audible sounds
I have a feeling I have been
in this place before
Not a pattern and not a color
Shameless but with no honor
I don't even know how I got in
No instructions to read
And no signs to follow
With no time left to borrow
No one is here but me
The admission was free
I can't see without a light
There are no exits in sight
Everything is pressurized,
Condensed
and definitely airtight
I can't tell which way is left
And which way is right
I must be inside my head
deader than dead