It seems paradoxical, but you have to do stuff to know what stuff you want to do. Looking at what others are doing is not the same as doing it, seeing what it feels like to do and if it is something you would like for yourself: The map is not the territory.

You are living life, even doing "nothing", time passes and you with it. There's no one/nothing out there to tell you what you might like and which things to choose, you figure that out yourself, for yourself, that is the only thing in life there is.

It's like Julia Roberts in The Runaway Bride, having to learn what kind of eggs she liked