You wake up in a Cryo Pod, find all the other pods mostly empty or full of Skeletons. You trip over a vault tec technicnian who died long ago and take his pipboy, now realising why as the Pipboy welds itself as the molecular level to your forearm. You can now never ever remove it.. but you can play games. It now runs off energy derived from your blood.
Leaving the Vault, you ran back to your old home to find Codsworth waiting for you. After greeting you you struggle to collect your thoughts and then he mentions that your wife/husband is waiting inside to see you. You go inside and find them now a skeleton perfectly cleaned in clothes sitting in a chair with a gun sitting on the table in front of them missing a single bullet.
Fleeing this terror you head into the wastes and come across a Dog. The dog accompanies you around the wasteland helping out. It is only in the last part of the game you find out the Dog is an Android and is actually programmed with the memories of your long dead child. Of course it will never have any way to express those as it barely knew its mothers/father.
Defeating the Institute/Brotherhood you decide to return to the vault, to go back into suspended animation and hope to wake in an Earth that has evolved past the need for guns and violence. The Pod mulfunctions as it did for everyone else and all the people you helped, all the places you improved all fall to dust forget as you are but another corpse locked in a stasis pod.