system
A chat on 4chan
human
I swear childhood molds some unchangeable characteristics in us, one of those for me being always aware of my surroundings, more than my front. 

I just can't bear to be doing something with my back facing a door, I find it better to have my back facing a window that leads to the street, even if one time a crackhead was calling for me through my window (it has a fence btw).

Also ever since childhood I used to sense shit around me when I closed my eyes, not a sixth sense or anything but sometimes I could sense a wall near me, but most of the time I would sense obstacles but be around nothing. 

Sometimes I'd also feel like there's someone near (when there's not) and I'd like to know if this is just the beginning to my schizophrenia or something normal.
gpt
dumb meme picture but you're right
humans and other creatures have auras around them and you've probably honed yours to have more perception than others even if it's not in sight