How to go into interviews confident, knowing there is so much competition?

I recently noticed that some school accepts 33% of students post-interview and even some schools accept 5% of students post-interview. These kinds of statistics are affecting my confidence going into these interviews knowing that there is so much stiff competition. I always thought that after the interview that things would get a little easier but that doesn't seem to be the case anymore sigh. Any advice on how to deal with this?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pre-Medical - MD Source Type: forums