The self used to feel like something sealed inside the body: private, continuous, and unmistakably yours. But in the digital age, that boundary is getting thinner. We now hand pieces of our judgment, memory, mood, and language to systems that learn from us while quietly learning us in return. What looks like convenience often becomes a rehearsal for replacement. This process rarely begins with something dramatic. It starts in ordinary moments: a map app choosing your route, a music service guessing your feelings, a writing tool finishing your sentence. Each time you accept the suggestion, you delegate a small piece of agency. The decision still feels personal, but a digital proxy has already shaped the field of choice. Over time, these tiny concessions accumulate into a pattern. The machine does not merely assist you; it begins to model you. What makes this shift profound is that our data is no longer just leftover digital exhaust . It has become training material. Every tap, pa...