Oh no! Don't even think about it! There will be no panic attacks! I know you will be just sweet and friendly, and the first thing you can say in that interview is "I'm nervous, this is my first interview ever", and that will totally break the ice. And if not, then that would be the wrong job anyway. Right now you should relax and let your fear be your fear. Don't try to suppress it, so it will not build up and become panic. You're nervous and that's normal, and the best thing is to limit your expectations. Maybe it will all go perfect, maybe not. It is definitely worth trying. You will grow from the experience in any case.