To the Moon and Back, Stupid (джен)

Bucky would never admit it out loud to anyone, but his most selfish fear was that he would end up alone. Or not so much that he’d end up alone, but that everyone else would find someone better and leave him behind.
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From a regular kid growing up in the 1930s, to a "semi-stable 100-year-old man," Bucky loves and loses his family, his friends, and himself. You can think of this as my answer to the question "what is Bucky doing and thinking whenever the camera isn't focused on him?" (Answer: wishing he was drinking coffee and eating a good slice of chocolate cake).
This fic covers events throughout the MCU up to and including TFATWS Season 1. There are spoilers. You have been warned.