Is the world really going to end in 2012 ??? (long)?

Okay so I have heard about this for like the past couple of years. I have always been interested about the earth, the universe, weather and stuff like that even since I was 4. I'm 12 now (don't get started about that I'm only 12 and I shouldn't be on here, because I don't give a sh!t) and I have watched shows about it and read about it on the computer, but I don't know if it's true. I have heard all about it and know every detail, and I have heard that an asteroid will crash into the earth, and asteroid would crash and have a 20 years on winter,nuclear wars, an illness all over the world,global warming, natural disasters, black hole, planet x will crash into earth and make it turn backwards. I don't know if I believe all of this I don't remember 6/6/06 because at that time I was only interested in the weather so I didn't know until a couple of years ago when they started to talk about the end of the world and every decade they have like dooms day predictions. I have been obsessed with it ever since I saw about it on T.V and sometimes I randomly think about it and it freaks me out sometimes. I know most of you are going to say crap about it and say its bull but I just want your opinions.