I am soo nervous about my interview tommorow?

Well i have been trying ot get a job for 6 years now no luck then friday i get a phone call from family video store locally and they told me that they are interviewing me tommmorw sunday june 26,2011 @ 5:30 and i stutter i am nervous when they ask me questions they will think i am a waste of their time. in which im not i maintain a 2.5 Gpa in high school and 3.45 in college and i am a current studetn a local community college i need help to get my first job..please real answers thank you