As I coach people, speak, or just help people out, I encounter a similar theme over and over again: people are A) not sure of what they want in life or a career, and B) usually aren't sure "who" they are.
This sounds a bit oddly touchy-feely, but it's important to have an idea of who you are and what you want (Babylon 5 jokes aside of course). When you're positive on who you are and what you want, you're active, focused, enjoying life because you're living it in that moment. Without it you're sort of meandering.
As I said, I encounter this a LOT.