You can study at the best university in the country but all of that means squat if you stutter through your job interview. Unless you're excited by the idea of living off your parents' goodwill for the rest of your life, you're going to have to look for a job.
And when a company calls back, you're going to have to put on an act at the interview. Because that's what interviews are — an act. In real life, you don't laugh that enthusiastically at a lame joke, or extend that much respect to strangers. The best thing to do is to prepare and play it cool. Learn as much as you can about the company, get there early and prepare your outfit the night before.