Don't stress too hard djyujin, you'll do a great job come interview time. Yes, it can be a tricky interview if you're not prepared (i.e. haven't flipped through recent newspapers, read a little bit about policy/ethics), but I agree with doc henry's experience, the build up is way worse than the bite.
I was so nervous before the interview, I swear, I could barely eat for a week before and week after the interview because this was/is my top choice school (amazing diet that works = interviewing for medical school

), but once I sat down in the room and started talking, the interview went surprisingly smoothly.
Do your homework, and most importantly carry yourself with confidence and it'll go great. Remember, 50% of your overall score comes from this interview, so use it to your advantage. The GPA/MCAT/activities can't be changed now ... but you have total control over the impression that you leave at the end of the interview.
😀