Sietzen oder dutzen

I like when people are honest. Lately I have heard from so many people that I speak good German. All the while when I know I'm not. Yes ok, I can make myself understood but German people prefer to speak English to me. Provided they do speak English of course. And you know what? I still have problems with the basics. The title on this blog was a chapter in my German course. Sietzen to me sounded like sitting, only slightly different spelling. Oder means or. But dutzen? Wasn't in my dictionary. And still isn't. What it means is Sie or Du. The formal and informal way of saying you. Easy-peasy in English. Always you. Singular, plural, formal, informal...always the same in English. Not in German. Exactly why ze Germans like to complicate things is beyond me, but best not mention the war :) http://www.youtube.com/watch?v=5MbeT7_ARm8