You might find this thread to be of use to you. We recently had a (very good) discussion about these kind of things.
To be honest, it always boggles me when I hear people my age complaining about this. I've always had a direction, even if I ended up changing it. Back when I was in my early-to-late teens, I wanted to be a neurosurgeon. I decided I liked research, so I wanted to do an MD/PhD. I finally decided that clinical stuff wasn't for me, so I decided on getting a PhD and being a neuroscientist. I have refined my research interests into developmental neurobiology in the past two years. Be proactive about finding out what you want to do and knowing yourself. Are you analytical? Artsy? A history buff? Do you like squishy things? Do you like computers? It's okay to like many of these things, too, but you can't major in all of them. The most scientifically supported trait theory of personality at the moment is the Big 5 (although trait theory per se generalizes something that can often vary), and there's an extra dimension of Honesty/Humility, now. Consider googling the Big 5 personality test on the internet and taking one.
A lot of people just don't have that, especially in their younger years. You should think yourself fortunate that you have such a clearly defined direction in which you want to travel. Even those with somewhat clear directions can feel lost. I myself just want to sit around making music all day. However, experimental Drum & Bass isn't going to bring the money in and I'm stubborn when it comes to this. I don't want a part time job, I don't want to have to do things because "that's just how the world is", I want to make my music. You can call me silly, unwise, or immature in that regard and perhaps you'd be correct, but you can see how people have things they'd love to do only to have society make it seem impossible. I also wouldn't mind doing music journalism, SFX/Foley/Music for moving image, or being writer. But again, all very closed off areas which demand you to work for free for a good while. Fortunately for me, my parent's, especially my farther, work incredibly hard and support my endeavours amazing. Even after paying all my rent and living expenses through university and then paying my rent for 6 further months afterwards, they're still going to lend me the money to do a masters in Sonic Arts. With this I hope to move in to the realm of Lecturing. Not because that's a direction I dream of being in, but because that's one I can see myself enjoying whilst support my true passions. I am of course very grateful for their support. But some aren't so lucky. If you take a minute to consider all the circumstances beyond your own experience, you'll soon see it's very easy to feel lost. Even if to you it seems silly with your sights as clear as day. Those personality tests also do little. They tell you all the stuff about yourself you already knew and nothing beyond that. But I agree knowing yourself well is certainly a benefit, but that's only half of it. Edit: To answers the post's question, I'm 22. For some reason I haven't quite figured out yet I still wish to call myself 21.
I confess I have absolutely no idea what you mean, but then again the concept is completely alien to me at least in the context of the direction of one's own life. As I said, this is something I've never experienced. Nor, frankly, wish to. Nobody goes into science to make money, admittedly, especially those of us who want to join the tenure-track rat race (the point is, though, that we often end up making money anyway). I know it's a Sisyphean task. I still can't not try. It's like it's embedded within my being. I guess in your case, music is embedded within your being. Problem being, I suppose, that a biology degree has far more bill-paying avenues than a music degree, and my dreams and ambitions are in, well, biology; even if I don't get a tenure-track job, there are numerous other ways to get into being a PI of some kind, and then there's industry and government and all sorts of folks that are hiring, hiring, hiring. I have no idea if you're still in university, but maybe - this is cliche - pop down to the career center and poke through its offerings. You might find opportunities yet.If you take a minute to consider all the circumstances beyond your own experience, you'll soon see it's very easy to feel lost.
I agree with everything that rezzeJ just said. I don't think there's anything wrong with not having a clear direction. I knew I wanted to do Engineering into college, and now that I'm graduating next year I'm starting to re-evaluate those thoughts. People's interests and what motivates them are constantly changing, and you're fortunate in that you seem determined in what you're doing and are confident that it's right for you. As for me, I'm fine with changing and re-thinking what direction I'm heading in. Same deal as rez, I'd be perfectly happy sitting around making music, doing music journalism, or focusing full-time on my record label. Unfortunately none of those things will pay the bills though. I have, however, learned to not care about what people do, what they make, and what their direction (or lack thereof) is. There is one caveat - that they are happy and not acting in a manner destructive to themselves and/or others.