I just got home from school and currently in 9th grade and while walking home with my school friend who is in 10th grade one year older she told me that our other friend gossips about me a lot every time the two of them text. I asked her if she gossips about anyone else she said no mainly about me. Then she tells me everything she told me behind my back.. which is.. how I do whatever people tell me to do and I don't really do my own stuff and that I just do the same thing everyone else does, I listen to everything people tell me to do and don't make up my own stuff so now that she told me all this I don't want to go to school tomorrow! I feel sad, left out, have no idea what to do and so on. I also promised my friend not to tell the gossiper what she said about me so right now the only thing going through my mind is I DON'T KNOW WHAT TO DO! I don't want to go to school tomorrow!

You go to school and you don't let what people think bother you. Are any of the things she complained about you that you can say the same of her? Often people do not like the qualities they see in themselves in others. Then they are the first to criticize what they do their own self. Maybe she feels hurt that you don't seem more of a friend to her than she would like you to be. Sometimes people will say and do the exact opposite of what they really feel because they can't accept that they actually like qualities about you. Some people just like drama.

You go to school and you don't let what people think bother you. Are any of the things she complained about you that you can say the same of her? Often people do not like the qualities they see in themselves in others. Then they are the first to criticize what they do their own self. Maybe she feels hurt that you don't seem more of a friend to her than she would like you to be. Sometimes people will say and do the exact opposite of what they really feel because they can't accept that they actually like qualities about you. Some people just like drama.

Yes there are things that I can say about her! I don't like it when she gossips and talks bad about people. Like, one minute she's a really good friend and she like so nice but the next minute you know she talks behind your back to another friend through texting.
And I'm not sure if the stuff she talks about me also relates to what she does. Because she's not like me in any way so Im not really sure..

Some girls are like that. I call it jr high games. Don't feed into it in any way. Just be the best friend you can but at the same time maybe distance yourself and get some new interests.

Well you know your friend who told you all of this could be/is gossiping too. Did she tell this girl that she didn't want to hear the gossip or let her know she was gossiping about her friend?
I would not pay attention to any of it. There are people who will say and think what they want whether it is true or not. Go to school and hold your head up high.

That is another jr high game. Complain to someone and hear everything they have to say and then go back to the friend and act like it was all the other one that did the complaining.
You have to go to school. Find new friends and interests if that's what you need to do.