Seriously, it was like reading the diary passages that I wrote when I was 13/14 years old and went through my puberty-typical "shitty world" phase

Ah, okay!It has nothing to do with your book, it was my mistake. Just confused the titles nothing more.
The whole symmetry/ asymmetry talk reminds me so much of an interpretation that someone here wrote. It linked the structure of the games -like, the map of Sub9 which represents a temple/ pyramid- to their content (Didn't WiQ write this? not sure though).Agnes told me she liked to live here and felt well in this quarter, even though it was not fancy and she did not know anyone there. When we where back in her appartment, she took a stack of tiny, opaque glass plates out of a cabinet.
"This is my work", she said.
At a first glance, the plates seemed to be cloudy in an irregular way, but when I looked closely, I noticed some minute dots in the gray fog which were placed in periodic distances to each other. On each plate, the dots formed different patterns.
"Those are roentgenograms of crystal lattices", said Agnes. "The actual structure of atoms. In its depth, everything is symmetry."
I gave her the plates back. She went to the window and held them against the light, one after another.
"The mystery lies in the void in the center", she said, "what we are not able to percieve are the symmetry axes."
"But what has that to do with us?", I asked. "With your own life and me and you? We are asymmetric." "Asymmetries have a reason", said Agnes, "The asymmetry is what makes life possible. The difference between the genders. The fact that time only goes in one direction. Asymmetries have a reason and a direct impact."
I never heard Agnes speaking with such an enthusiasm before. I embraced her. She upheld the diapositives protectingly and said: "careful, they're fragile."
Despite her warning, I carried her to the bed. She got up again to bring the plates to safety and then came back, got undressed and lay down next to me. We made love and it became dark outside. I stayed with her for the rest of the night.
In the morning, I was waked by knock noises from the radiator. I sat up and noticed Agnes being awake.
"Someone makes knocking signals", I said.
"That's a steam heating, not an air conditioner like in your appartment. The pipes expand because of the heat and make those sounds."
"Doesn't that annoy you? I could not sleep with this noise."
"No, quite the contrary", said Agnes. "It makes me feel less lonely when I wake up."