Don't worry, once it's all over you can just chill and say "ya know what I did my best", that's what I did when I thought I bombed my second physics exam.
And tbh that sounds like stupid stuff my dad would say, I can still hear him getting mad at me when I procrastinate on an assignment or stay up late doing schoolwork. But I thought I would be buried in loans, and I actually ended up getting a really good scholarship to go to my first choice college; ya just gotta work hard.
Idk who acts like being an adult is great, but all the adults I know want to be teens again. Hell I just told my dad last night I don't want to be 20. But idk I guess adult life is whatever you make it.