You and your older sister used to do everything together. She was your built-in best friend. But lately she wants the door shut, the phone private, time with her own friends instead of you. When you knock, she says "not now." When you try to join in, you're "too young." You're not sure what you did. Nothing, probably — that's almost the worst part. She's just changing, growing up and away, and the person who used to want you around now mostly wants space. You miss her, and you don't know whether to chase her, be angry, or quietly let go.