World end in 2012? what do you think?

hey guys! i just think this whole "world will end in 2012" is mind bobbling. i just wanted to here from your opinions of what you think and provide details. how could or couldnt it happened? so maybe just provide some details and other stuff supporting your answer. heres a summery of what i think. i understand some type of plate shifting will happen but i really don't know anything about that but heres what i do know. if that strange planet thingy, Nibiru is supposed to crash into us and it is supposably "jupiter" and its 5 times bigger then earth and its "orbiting towards us right now" why can't we see it? and i know the mayan calender will end but who said OURS will. maybe they all just never finished it. sometimes i just get really scared of this thought of the world ending. i mean yes i know it will end, but....2012? i will still be very young and not even in my 20s. what about our parents? i can just picture the horrors of that day and it scares me. what about all the newborns that were just born before it happened. i really dont want a just "no" answer. please provide details because there needs to be a reason you think that.