A Weirdo Sister

I'm really tired.I've already tried all my best to be a happy girl and never think so much but she really makes me crazy.In the school today(aug 19.2009) I saw her with a group of friends.She saw me but she keep hiding from me like avoiding something from me.I don't really bother about that.The worst and sad thing is on my birthday,she never wish me!! That's very sad you know that? I really want to know whether did i do anything wrong to her ?? I really want to know !! My question is DID I DO ANYTHING WRONG TO HER?!!!!! When i didnt see or receive her wish i feel that in her heart i'm not exists anymore.I'm giving up now.I'm too tired of friends and SISTERS !!!! I HATE EVERYONE !!! MY LIFE GOES BACK TO THE SAME SITUATION.