You have to determine what you want.
What do you want out of a relationship?
What do you want in your “career”?
What do you want your 20s to be like?
If you don’t determine what you want you’ll just float along headed nowhere. As you evolve the things that are important will change. Or life will happen and you’ll be forced to change the things you want.
But you must know them. Knowing determines whether you take that job, read that book, date that person who is really awesome, but, maybe smokes too much.
Know the path you’re taking. The journey you’re on. But don’t be so attached to it that you aren’t willing to be flexible, and have a little fun along the way.