There must be something in the air because I realized the exact same thing yesterday. I started Spring term and I'm starting my seminar class which is an intro to my senior project-which I will be working on all of next year! I was so nervous, and I was nervous about getting all the required classes done in time for me to graduate. I was also stressing about finding a place to volunteer at so I can get accepted into graduate school. I realized it yesterday that this is an adventure! Sure, it's great to plan ahead, but even if something happens, I can deal with it when I get there. No matter what the outcome, it will be life experience, and that's perfectly okay.
Congrats on your house passing the inspection! That's generally a 'make or break' type of thing, so I completely understand why it's stressful to many people.