Comment by codr7

I would say to hell with useful, being useful is for tools, focus on happy/excited and that will eventually lead to the right place.

Feeling that you have a role to play, a unique contribution to society that is appreciated, is not really the same thing as useful. But it's where you want to aim. And that includes figuring out what you are supposed to do, which is where joy/excitement plays an important role as a guide.

Letting other people's expectations define your life will never work, enough people have tried and failed by now.