This is a passage written by Ian McEwan. See if you don’t look at yourself in a whole new way after reading.
“She raised one hand and flexed its fingers and wondered, as she had sometimes before, how this thing, this machine for gripping, this fleshy spider on the end of her arm, came to be hers, entirely at her command. Or did it have some little life of its own? She bent her finger and straightened it. The mystery was in the instant before it moved, the dividing moment between not moving and moving, when her intention took effect. It was like a wave breaking. If she could only find herself at the crest, she thought, she might find the secret of herself, that part of her that was really in charge. She brought her forefinger closer to her face and stared at it, urging it to move. It remained still because she was pretending, she was not entirely serious, and because willing it to move, or being about to move it, was not the same as actually moving it. And when she did crook it finally, the action seemed to start in the finger itself, not in some part of her mind. When did it know to move, when she know to move it? There was no catching herself out. It was either-or. There was no stitching, no seam, and yet she knew that behind the smooth continuous fabric was the real self—was it her soul?—which took the decision to cease pretending, and give the final command.
These thoughts were as familiar to her, and as comforting, as the precise configuration of her knees, their matching but competing, symmetrical and reversible, look. A second thought always followed the first, one mystery bred another: Was everyone else really alive as she was? For example, did her sister really matter to herself, was she as valuable to herself as Briony was? Was being Cecilia just as vivid an affair as being Briony? Did her sister also have a real self concealed behind a breaking wave, and did she spend time thinking about it, with a finger held up to her face? Did everybody, including her father, Betty, Hardman? If the answer was yes, then the world, the social world, was unbearably complicated, with two billion voices, and everyone’s thoughts striving in equal importance and everyone’s claim on life as intense, and everyone thinking they were unique, when no one was. One could drown in irrelevance. But if the answer was no, then Briony was surrounded by machines, intelligent and pleasant enough on the outside, but lacking the bright and private insidefeeling she had. This was sinister and lonely, as well as unlikely. For, though it offended her sense of order, she knew it was overwhelmingly probably that everyone else had thoughts like hers. She knew this, but only in a rather arid way; she didn’t really feel it.”