Let's face it, from kindergarden to the end of college, what we have is a set of "levels", a fixed path with very very few points where you can actually decide something. The natural step is to reach the next level and keep doing roughly the same. More tests, more lessons... etc
BUT, when that system ends, there is a void. The adult world is not "a fixed system" or "the next level in the game", but a whole chaos, full of options, opportunities, uncertainties. And that freedom can intimidate, specially if someone has been focusing in excelling in the educational system and has the perception (not necessarily that's a real thing) that none of that is useful, that other people already have links (which a lot of people will form) with this new and weird "life outside academia"
I mean, it's a great thing, but I can totally understand that it's scary at first.