Chatterbox: Down to Earth

Advice:

So, I'm really sad because me and my friend got into this argument because she changed and she use to be a lot nicer and also there is this girl that is also our friend and we were teasing her but it was just a joke.  Then we apologized because it turned out she didn't like it even though we thought we were kidding and then I was walking with the friend I got into a fight with and she said that she never teased our friend in front of her but she did and she was SO lying and then my friend who I'm fighting with told my other friends something and now they are being mean to me and I didn't do anything wrong anymore than she did but they instantly took her word over mine and whenever I try to talk to one they just made an excuse and it really hurt me because she told all of my friend something I do not know what and now I hate them because they were my friends and so easily she was able to turn them against me and they should at least hear my side.  And later I told our friend who was teased that the friend I am fighting with said that she never teased her in front of her and before that friend was like NO I DIDN'T!  And then that friend was there and she acted all offended and said that she didn't say that so she keeps going and changing her story.  And one friend I was walking directly towards and I didn't turn because I was just trying to ignore her and I thought she would turn but she didn't and then we bumped into each other really hard.  And then she thought I did it on purpose and she punched me really hard in the arm.  And I can't ever forgive them because it turns out they are horrible and they don't take my word for anything and they weren't there for me when I needed them but now I have no best friends at my school although I have other friends in other places and I can't have no social life and I xan't make other best friends because everyone at my school is in their groups very tightly.

HELP!  What do I do?