/(uwu)/ ok so that’s a lot of spoilers but here’s some answers anyways:
yeah, they’re painfully aware of your existence
the narration is supposed to be you thinking, so yeah, kind of like talking to yourself. i can’t answer the second q because that’s a big spoiler!
you can interact with other people through the protag in multiple ways, but if i say them that’s like revealing a crucial plot point of this story so yeah.