Leading A Life of Quiet Desperation

So. Here I am, living on my own, looking out for Numero Uno. I've taken steps to ensure that I'll be OK when I retire...but what about until then? What do I want to do with the next 40 years of my life?

I told my mom years ago that I wanted to do everything, and so far I've lived up to that. Back in elementary school I was voted "most artistic" of my class, and through high school and college I pursued my art skills to where I was actually "publishing" a web-comic once every week (for a short-lived six weeks). At the same time, I took music lessons, first learning piano and then moving on to the guitar, eventually forming an actual rock band and performing in college. At one point, I was a paper aerospace engineer. As to my active side, I started in baseball, moved onto soccer, learned how to ski and snowboard, took up ultimate frisbee, got into tennis, and finally jumping whole-heartedly into cycling. Lately I have picked up target practice. I am a computer programmer by day.

So who am I really? What is it that I really want to do? What is it that I really like? I watch TV, read the internet, and see all of these people who have specialized in one thing and been successful at it. I find myself thinking "I could do that", then I jump in and for a while (a few months, perhaps a year) I actually do that, but then something new catches my fancy and I'm off to another thing.

Maybe that's my real hobby, my real pastime--a meta-pastime, as it were: to jump into as many pastimes as possible, to take them as far as I can, plateau, and then jump into something else. Lately, it's been the stock market; I read Rich Dad, Poor Dad and suddenly, in the span of about a week, I've become a gazillion times more financially literate than I was just a week ago, and odd phrases like "refinancing" and "what has your money done for you today?" take on new meaning.

But I know myself well enough now: in a year, maybe even a few months, I'll be back to searching for a new hobby, a new craving of knowledge to fill. Maybe it'll be skydiving or scuba diving or...I dunno. Who knows.

And I'm worried: will it be this way forever? Will I never find something, settle on it and say "this is it--I can do this for the rest of my days"?

I'm flailing about right now, casting around for things to do, while trying to reorganize a little bit. I've sold off a guitar and an amp and some other gear to simplify a bit, but then I've started pursuing music again. I fired up a childhood computer game (Tanarus) that used to consume, literally, half my waking hours to play (sorta like the MMORPGs, but this one is more action-oriented, driving tanks around). I've contemplated getting back into airplanes and art.

But what am I really looking for? What do I want to accomplish in the next 40 years? In the next 20? 10? 5? In the next year, where do I want to be?