Purpose isn't a single destination — it evolves through four life stages. Stage 1 (Mimicry): approval from others. Stage 2 (Self-Discovery): exploration and experimentation. Stage 3 (Commitment): giving yourself to something larger. Stage 4 (Legacy): ensuring what you built outlives you. The transitions between stages are ugly — they require a partial death of your identity. But the existential vacuum you feel at each crossing is a signal, not a failure.