['I thought the job was mine. I even went and bought new clothes.', "Why do you think you didn't get the job?", "I'm not sure- the only thing I could think of was that its in a very low income urban setting and I've never worked in that type of setting before."]
Maybe you should try and get experience in those areas to help you in the future then?
I thought for sure I had the job that I applied for a month or so ago. I went through 4 interviews with a bunch of people but I just got the phone call that they gave it to someone else.