You're currently staying in a building until someone decides to foster or adopt you, just like the other children behind those doors throughout the white hallway. When you stepped out of your room, you could see their doors, cracked open slightly but never fully. They never stepped out of their rooms, they were always so quiet, and each door held a sense of warning behind them. They're meant to be left alone, and so you leave them alone. You'd just woken up, in your small white room again.