Why am i feeling so different since 2011 came?

i'm 12, i agree, the stereotypical 12 year old is young and annoying, i'm year 8, and we really aren't like that, i know a lot of people that smoke and stuff, all chavs(12 year old smokers not people who smoke) but yeah, so i'm not some middle aged depressed woman. But when 2011, i decided i'd be a little cooler and so far, just in a month, alot has changed, i have a whole new a ray of relationships, friends and 'boyfriends' and i'm much happier as i was last year. But recently, old things have started to repluse me. I need new everything, these weekend i spent 70 quid on new stuff, i've put loads of stuff all over my room, to represent me, yet i want more! Changes are always really big, i never get new things friends or objects. and also why am i in a mood with everyone? Not that i show it, just everyone is doing things wrong! Being selfish, fake, and drama queens. Except one person. Is it hormones? It's everyone. not just someone i hate.