Once more about the university choice

I'm already decided, but is it the right decision? And then, how about the people who are making the choice when they're just fifteen?
From my point of view, it's apparently better to continue studying as long as possible (optimally for the whole life). On the other hand most people probably see education "just" as a possibility to get a job and prolonging studying would be rather a torment for them. So one could say that choosing a vocational school at 15 may equal to choosing to study (in fact) as little as possible. Yet it doesn't change the reality that they still have to choose the vocation.
In past economic considerations of the family might have been a factor why not to continue studying as well, but I'd say it's less pronounced today. First with today's wages I think it's very well possible to make your living (though perhaps modest) working part-time together with studying  and then there's a very big pressure to study, even if it was a "primitive" course - just to have a degree.
Nowadays me and my peers are 18 or 19. Should we already know what to do next in our life? The number of possibilities is huge (even though some people are forced by their parents to a certain field - and, according to my experience with those people, it doesn't do any good for them :-( I don't know what to do next, I've chosen my future course partially because of that it enabled to continue in almost any direction.
Now not that the work was the only part of one's life, I'd say it would better be just one of many parts. But probably an important one. While the productivity may stile rise, it will be a while (if ever) till machines do all the work. After all, satisfying work may bring at least some meaning to lives of some people.
The school doesn't really help in choosing the university course. In some cases, it directs you to what may satisfy you, but in a very peculiar way. What we learn in the school as Math is mostly mere counting (and it's true I chose Math partly because I like counting - now the question is if it doesn't result in much disappointment...). Czech language is mostly literary history, etc. No wonder so many people completely reselect their studies after a year or two.