I have always been the kind of girl who cares a little bit too much about what life would be like in the future. I would discover myself to know exactly the career I want to pursue in the future. I do this because I know subconsciously how scarce our resources (time) as human being is and thus, we should spend time on developing the skills for our future career.
However, the problem with this is that no one can predict the future. Things will happen that changes situations. Therefore, it is more important to enjoy the moment!
If you were ambitious, then you should prioritize the 3 most important aspects of your life and focus solely on these while of course, being open to other aspects of life as well.