Why?

Well, It's summer holidays here, (Australlia). And I was getting really excited and stuff, as I thought I'd be going out with my friends alot and doing stuff. But now summer holidays is coming to an end. And ALL of the holidays I haven't been invited out anywhere. I must have asked people to go places with me at least 20 times, each time they all made up pathetic excuses like.. "sorry going shopping" or whatever, and I know they're lying. And I just can't stand it, these people are meant to be my friends. And when they're talking to me they're all like "OMG I WENT OUT WITH ANNA THE OTHER DAY AND WE WENT DREAMWORLD" and stuff like that, and ALL my friends have been going out with each other etc, totally leaving me out, and it's making me really sad. Here's an example. (real conversation)

Kate: I went the movies today :D
Me: Who with?
Kate: Cat & Dan
Me: cool
Me: you could of asked me :}
Kate: Uhm.. no.. it was just us 3.
Me: Ok, cool.

etc.

Lol don't get to paranoid... You orginise some things to do, make them intresting thou or people will just say no :)

Summer holidays suck when it ends up like that. Maybe just ask a few friends to hang out at the beach or something and say that you'd like to catch up more coz you havent seen them much latley. Um or catch-up with old friends or make some new ones =)

they're not your friends, they're trying to get rid of you by the sounds of it.
go find some better people to hang with.