Please help! mood swings?

[Mark L]

I'm 14 and recently I have became extremly depressed and I don't want to do anything even my hobbie which is reptiles and the thing I can't stop thinking of in my head is : why do anything if the world is going to end. I know it's not going to be in 2012 but others have said near 2020. Usually I'm a super happy guy but now I just can't do anything. Please tell me if what I am experiencing is normal and your opionons on if u think the world will end in my lifetime. I'm not that into religion in fact I'm a atheist so I don't believe in jugdement day and shit like that. Please I need to know how to foget about if the worlds gonna end and stop worrying so I can enjoy life again. This is my last restort please help