I think this is a realistic and healthy attitude. I do think it typically does not take long as an actual student to realize how this all works. You will quickly learn about older students and recent graduates doing amazing things you would love to do. You will learn about other students and in fact graduates who are not clear yet on what they want to do. And yes, you will learn about some other students and recent graduates who are not thrilled with what has happened so far.
But all of those groups exist at any good college or university. And so virtually all new students quickly learn that the “hustle” has not ended, it has just moved on to a new phase.
For now, though, you haven’t met all those people yet and learned their stories. It is all still just an abstraction. So of course it is hard to really internalize. For now.
Probably not much longer, though. For good or ill, usually the reality of the situation hits fast once you get started. Indeed, you might want to look at what is sometimes called the first year “W”-shaped emotional curve:
https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/the-w-curve-theory
The point is not to be afraid, just prepared. Fortunately, college administrators are well aware of all this, and good colleges all have support available. But you are very likely to go through some version of these ups and downs and back up agains yourself, and that is all OK.