You don’t know who you are.
You don’t know who’s sitting next to you.
You don’t have any clue if you’ve chosen the right track to study.
You don’t have much more than a guess whether or not you’ve got talent.
(and how much talent you do have, as you will discover, has little to do with success)
I’ve thought about what it feels like to sit in my class on the first day.
I’d taught for 10 years before this nugget of wisdom came to me.
It sure ain’t much, but it’s all i got.

Welcome to what you’ll never stop wishing you could go back to once you leave.
Welcome to graduate school.