You don't truly realize how stressful flying can be until the day of your flight. You start second guessing if you have everything you need and panic over things you know won't happen. You'll spend the whole day wondering just how uncomfortable you'll be and then you'll start panicking about being late.
While it might feel like everything isn't going as planned, always remember that life isn't perfect. At the end of the day, you will make it through your day, no matter how chaotic it can get.