A student told me the other day that he is scared going into each of his advertising classes. Not scared like is the boogey man hiding under my desk. More like scared that if he didn't show up and perform his best in each class he'd miss something crucial to his career.
I was impressed. Feeling a bit scared is good for everyone. Think about it. Being scared heightens your senses. As a student, you'd listen more intently and try a little harder. If you attend each class believing you know everything, you probably miss out on a lot of content. But, if you go into each class believing you don't know everything and being scared you might miss something, you'd act like a sponge, trying to soak every piece of information in.
I always go back to the competition thing. That every other student in your ad classes is your competition. Look around, do you see any one in there scared? You'd know them because they're the ones who never miss a class and participate as fully as they can. And those guys are your competition once you graduate.
A dose of fear is a good thing. It keeps overconfidence in check. I can tell you every single person working in advertising is a bit scared right now too. Scared of being out of a job. And the ones who take that fear seriously become more present and engaged in their careers.