I calmed down a lot after reading it and then realised how stupid I was being haha.
Also, I heard that the reason why the world was "going to end" was because the people who wrote the calendar all those years ago suddenly stopped at the end of 2012. I don't know if that was just a load of rubbish lol
Basically what happened with the Mayan calendar is that they had 2 seperate calendar in rotation; a Solar one, and one following the movements of Venus. The reason that the 2012 calendar stopped was because they have the next calendar in progress in order to pick up where the other one let off.
So a few thousand years later, some archaeologists found the 2012 calendar, the details were released. And HEY PRESTO! A lot of people began to think that 2012 is going to be the end of the world.