Wondering why the world didn't end today? I mean seriously, are you? If you are, then you are an imbecile. But just to answer the question "Why did the world end today:"
The Mayans were a group of ancient people who couldn't even predict their own demise, let alone European invaders. Did you honestly believe a nearly extinct people who were slaughtered 500 years ago could predict the end of the world using the Gregorian calendar (which they didn't have) on the shockingly Western date of 12/21/12 at 11:11 GMT? Honestly? The Mayans didn't even know there was a Greenwich.