Nervous first-date jitters are typically answered by your friends' confident reassurance that everything will be just fine if you simply be yourself. The same can be said for a job interview; projecting your true self, in the most presentable manner, will get you further in the hiring process than someone who doesn't put her personality out there.
Susan L. Hodas, director of talent management at NERA Economic Consulting admits she and her colleagues apply "the airport test" to candidates. They ask themselves: "Would I want to be stuck in the airport for 12 hours with this person if my flight was delayed?" Consider this when you enter your next interview and be the likable, friendly, interesting person that you are when you're around your friends.