Was I even there?

I was at a job interview today. I guess it did go pretty well, but there's always a thing or two you forget to say or wish you didn't say at all. Why is it so hard to emphasize on the things that matter, strenghts that are important to the position you're applying for? Somehow it's easy to be side-tracked as the interview goes by and you find yourself talking away not having a clue what the question even was to begin with! Is it the nervousness that shortcuts the brain? Or is even you that is being interviewed?? I really don't know what happens. All I know is, that after an hour or two after an interview, I'm wondering if I was even there, or if it was my evil twin not wanting me to get the job and luring me into answering the questions the weirdest way possible?!
The worst is that I'm not sure how many interviews you have to go through before you know exactly what to answer to all these questions. I'm afraid it'll be too many before you can get it perfect and by then you've given up hope of even getting a job at all!

Well, all I can do now is wait in agony for about a week, hoping that I will get a second chance and the next time around emphasize on the things that really matter! ;-)