Being able to make jokes when you are not feeling your best is a very good thing. You hit on many of the possible reasons for your feelings. The first year of college is perhaps one of the greatest transitions a young person can go through. Everything is up in the air, everything is new, and nothing is nailed down about the future.
The truth is I’d be surprised if you were calm and serene during this hectic transition. The university you’re at has counselors that are highly trained and available for you at either low or no cost. I would highly recommend you make an appointment to have a discussion with one of these therapists. They can help you sort through the angst and come up with a game plan that should be helpful.