No no no no no no!
The people who first thought 2012 will be the end, made an enormous mistake in their calculations.
There are 13 baktuns in the Mayan calendar. They say "last baktun is over = Earth dies", they say that will be when the date is 13.0.0.0.0 (2012). But we still have another baktun before the supposed end. All 13 would be over when the calendar pops to 14.0.0.0.0.
We're not going to die :D