Sometimes you have to look at yourself in the mirror to realize you are not a kid anymore.
You're all grown up now. You've learned to walk, to talk, to think.
You understand what it is that you want. You have no doubts about it. Not what you 'should' want, but what you truly want.
What you 'should' want is complex; it relies on what other people think of you. On how you will measure your success. What you want is simple. It's so simple that you can describe it with a single word.
What you want is what you worry about the most. The one thing you keep planning for in your head. It's what keeps you up at night.
Just one word, what is it that you want?