Why don't they make square flat screen TV's?

WHAT is the point of the rectangular screen? We got a new 26 inch flat screen. The screen settings start at “normal” and go all over the place, to zoom, to wide, etc. All of the settings, other than “normal” distort the picture in some way. They stretch the people out, or they cut off the tops of their heads or they cut off the words scrolling across to bottom. However, in the “normal” setting you’re looking at about a 20 inch, square screen. If square is the “normal,” why isn’t the screen “normal” IE: SQUARE???