So I was writing a story and realized that there was more then enough background material from the characters and actions that these characters went through to write a whole book just on them and the adventures they went on beforehand. But that story would have no real plot. The characters and people in the story would have many adventures but, at the end of the book, all that would have really happened would be that they would have gone from children to teens to young adults... that and it would be fairly traumatizing as they don't exactly have happy happy lives, that's why they go so far to have fun... so basically...
So do I need a plot for this book.... or is 'sorrow and fun' enough of a plot? I mean that's the 'plot' of 'Doctor Who' so...?
EDIT: Its not much of a "Coming of Age" story, only one character really "Comes of Age" during this story, while the others grow up there's an important difference between growing older and "Coming of age", and the one character that does is a secondary character.
Any help here would be great.