Many commenters here mention that they were/are really bright but also undisciplined and miserable. This underlines something I've been thinking about a lot: that cognitive style accounts for a big chunk of life's success. Think of the dumb-as-pigshit ladies' man or the happy-as-a-clam soccer mom who has life all figured out or the salesman who pulls in a ton of cash because he's really driven and doesn't give a fuck…
As one of those nerds in his early 30s living all alone by himself in a 5x5m studio, what's so wrong with "not figuring life out" and instead only caring about what interests you most? :)
Mind you, I used to have a social life until not long ago (when I was still happily married to my soon to be ex-wife), but at some point along the road I read Seneca's "De Brevitate Vitae " (http://en.wikipedia.org/wiki/De_Brevitate_Vitae_%28Seneca%29) and I realized that much of what I was doing at the time was really meaningless and not what I really wanted to spend my time on. And then my wife did me a ton of good and left me :), but it was for the best, cause as Seneca was saying you cannot buy back time wasted on meaningless pursuits (acquiring riches, high political honors etc.).