Do any of us know where we're going? Perhaps the lucky few who have discovered, truly, who they are might. But for the rest of us, I think just knowing where we are is the best we can do.
Speaking for myself, I've always found that "where do you want to be in five years" a terrible question. Who can know such a thing? Well, no one, obviously. So I'll rephrase--who has any inkling of such a thing? There are things I'd love to do--travel off of this continent, buy a house, pay off school loans. Those are my top three. But to put them in a time frame fills me with anxiety and throws into sharp relief the time I've "wasted" or spent otherwise.
And, of course, sometimes the universe has other plans for us. So. Back to the beginning. Knowing where we are, where we (sometimes, quite literally) stand, is, with whole-hearted certainty, the best we can do at a moment's notice.