Have you guys faced the problem of wanting something but not knowing how to get it? That dream job, university, etc ?

No, generally the problem isn't about not knowing. Very often the path is very clear - what one has to learn, what one has to do, because that information is abundantly available on the internet.

The challenge is often about not having the time, or stamina, or perseverance, or resources, to actually do all that is required to reach the goal