"Lost Boy" was the first song Ruth B ever wrote. The 20-year-old Canadian singer and songwriter explained in her Songfacts interview
that it started as a 6-second Vine clip. "One day I was down at my keyboard playing with random chords and just singing different words. I happened to sing the first line of the chorus, 'I'm a lost boy from Neverland, usually hanging out with Peter Pan,' and it was just that. I decided to post it and it got a pretty cool reaction so I started adding more and more lines, and then eventually sat down to write this whole song, which was fun."
She continued, "When I originally posted the Vine, it was just some catchy words, but when I sat down to write it, I really wanted to make it more than that because I think the song had the potential to be super cheesy and just about Peter Pan, but I wrote it from a more personal place when I actually sat down to write the song."