on average 13 by 12
feet?
to compare the dearth of space
was something that I have grown accustomed to
use either "had grown" or "grew" for continuity
I became obsessed with gaining every ounce of space I could obtain by cleaning thoroughly everyday as to not waste an inch.
Since "ounce" is a weight measurement, I wouldn't recommend using it. Maybe "every bit" or you could use a length measurement again. Also, "every day" is two words.
how compact and concise my life was.
You can probably cut "concise," because it makes it seem like your life is short. It doesn't exactly fit there
are like limited spaces in which I value
you don't need this "in"
Well written =) I hope you get in!