I Had a Job Interview That Went Badly

So I prepared for this job that I really wanted. I wanted it so much I drove myself crazy preparing all week in lock down. I spent every hour of every day in the run up to it watching YouTube videos, answering questions on the Web and writing my strengths, weaknesses and experience down- I even recorded myself. When it came to the actual interview via webcam I totally flunked it. I stuttered all the way through, I had an outburst, I rolled my eyes, I almost cried. My friends said to me that it was only one interview, that I should not worry about it, but I can't help but feel totally demoralized. I know I should just dust myself off and try again, but my head hurts and I want to cry every time I think about it.