Thanks for your post which makes sense and you have expressed yourself clearly.
It is a while since I left school but can relate to your feelings. You have spent 13 years at school then it ends , it is a huge change in your life.I am sure many of your friends would feel the same.
School is different and yes going to university or starting work is different and full od different expectations.
I wonder if any of your school friends are doing the same course at uni?
All your feelings to me sound reasonable. You chose the name creative so have you chose a creative course and are you looking forward to it.
Uni is different from school, but you will meet lots of people and have opportunities you may not have had at school.
It really makes a lot of sense and many reading this maybe feeling like you are or like me remember those feelings you have expressed so well.