Is it because im overweight that people dont like me?

[Courteney]

Im 15, 5'3 and umm a UK size 14/16. In the New Year im starting this extreme diet and fitness routine to be a size 12 for prom next year though!
Recently my friends always cancel on me and only like once every couple of weeks do i go out with my friends. Also a couple of boys make jokes about me like 'its funny how he calls you babe because you look like a pig' Its got me so down. I feel so unwanted.
By looking at a couple recent photo's of me could you please tell me your first thoughts, honestly. I just want to find out what people who don't know me think, Thank you!

1:
https://twitter.com/CourtsWaldron
2:
http://www.facebook.com/#!/photo.php?fbi...=3&theater

^ right one

3:
http://twitpic.com/bk8vd7