Same thing happened to me after my interview 28 yrs ago with this company.  I left the interview and sat in my car and said "Self, keep looking.  You blew it".  That was my first job with this company and has turned out to be the stepping stone of a very fulfilling career for me in HR, Marketing, and now the position I currently hold, EA to VP of Sales.  I interviewed with the Director of HR at the time who has since retired.  He is known for his tough interviewing technique.  I worked for him for several years and we have kept in touch.  Like I said, think positive.