A Question Mark On Everything

All I know is
all I know?
I used to think
that was right.
However,
I don't know
anything.
I see the walls,
the windows,
the bed and doors.
I don't even know them
anymore.
Did I ever know?
I don't know.
Nothing's quite real,
but I'm not scared
to be lost.
Maybe knowledge
is nothing more than
an idea?
Reality may be nothing more
than perception?
The only reality I have
is now, and even then
I just don't know.