According to the information you provided, the lines you quoted seem to be spoken in a certain novel or web novel. In novels, characters often experience some self-doubt and struggle to realize that they are not real humans but some other existence.
However, the specific meaning and background of this sentence needed to be determined according to the context. It could be a mental state, a metaphor, or a part of a particular plot. Therefore, more specific information was needed to determine its meaning and background.
Well, some libraries might have digital collections of manga that include JJK. You could also check out official manga apps or platforms that have the licensing rights.
😋I recommend the following novel to you. I suggest you read the book,"Xialan's Counterattack and Becoming a God." This book was also an urban youth school novel. The male protagonist was also a different kind of hero. He had the Taotie Devouring System and could eat to increase his strength. He was also very similar to Zero. The story is very interesting. I recommend it to you. I hope you like this fairy's recommendation. Muah ~😗