I had no clear career goals. I didn’t even know what I wanted to do after I finished my undergraduate degree. More often than not I think people don’t know exactly what they want to get out of a career, even very late on in their lives. So don’t worry too much if you don’t know either. If you do that’s great too though.
As I child I knew I wanted to be a scientist, but I did not really know what kinds of career scientists could have, so therefore I did not really have any clear goals. As the others have said, it is probably best not to try to plan too much, but rather do what you are interested in.