It wasn't bad. Not sure if they'll consider me for the seat, at parts I was in fact buffering. xD
About that question, I wasn't asked for it, but I mentioned it myself anyway.
Said, "When I saw my results my confidence was shook, but I knew I had the potential. I said to myself that I won't settle for this, and decided to drop."
They didn't smile or something, but to me it seemed that they appreciated it.
Don't get too nervous, the interviewers are totally friendly. Just make sure you remember important concepts (not facts, 'concepts').