In my experience, there are three groups of kids in high school, at least concerning future studies/employment.

One group maybe wants to do something because it pays well, with no motivation because they aren't passionate.

The next group is very passionate about one or two things, and have lots of motivation. However, they seem to view that as the only option, even though more likely than not it will change and shift.

The third group has motivation to do work that is interesting, but they have know idea what to specialize in and have a few things they don't want to do. They aren't necessarily good at it all, and it's overwhelming to think about plans for the future because of the open-ended nature of that question to them.

This is what I've observed. And of course, people change between these groups all the time.