Why the earth destroy in 2012?

Okay this is why if u have a calendar go to February 2 and if u see it says new moon but in 2012 it will be a full moon and that is going to cause a comet to crash into the earth and destroy it about every 150 years a comet blasts out into space big anon that we can see it but in 2012 being a full moon it will get extra power and hit the earth some people believe that dinosaurs were destroyed by a volcano yes but also a comet I believe it was a full moon a comet hit earth causin volcanos to erupt and burn all earth then over the years it cooled down and well god decided to make us because he thought we were smart inof. To think of something well the only way we can destroy the comet is by water a lot of water if the comet hits the ochean we are safe long long time ago like 300 years ago a comet was about to hit earth the people were scared a girl name Eva Toledo them everything is fine then the terror of light hit the comet and the comet begun to move away slowly I got this from a show h2o but they could be on too something but one problem mermaids don't exict and right now I kind of wish they did so I'm telling all of those scientist 1 I don't have a good spelling and 2 don't just sit and wait for something to happen I'm under 15(way under) old girl and I am even taking this seriously the thing is I feel like I have to do something and it feels like I have a connection with Eva besides our name the thing I am really scared about is that Eva never returned after the terror of light and in the show h2o it says Eva was a mermaid and it's really scary because I feel like I have a connection with water and all please tell me what to do