I don't feel like myself?

For some reason, now when I see something that would make me laugh, like some Monty Python or some Halo Reach Fails of the Week or Achievement Horse, part of me thinks it's funny but another part doesn't laugh. It goes, that's horrible! I have been experiencing these feelings for a while, and I don't know what to make of it. I used to to know my opinions and stances, but everything just seems unclear now. I'm 14 by the way. Also, I've been hearing a lot of this new age stuff about how there is supposed to be a "dimensional shift" in 2012, and I am not sure if I believe it. It feels like I'm being manipulated whenever someone talks about it. Also, lately, my mind inadvertently comes up with a dumbed down, logical explanation for EVERYTHING, and it considers everything humans do to be dumb, pointless and stupid. It's like it feels that we have to be serious all the time and work toward becoming a better race every minute of every day. I know that is illogical, I think it's mainly fear. I can't get these fears to see reason. I can still feel a part of me that knows everything is fine. Can someone help me?