i have a friend who have an attitude that i cannot bear it, so does in our group,she is self-centered, rude, arrogant, and dominates the whole conversation about her, not giving us a chance to speak and really annoys us up to the point that is no longer good for our mentality, really controlling, I want to go to the library, but can't cause she doesn't like it, sometimes I want to be alone but doesn't respect our privacy and our wishes. and relies on her parents, relatives and "connections".

I wanted to talk to her about that, but her mind is weak, she has depression, i fear if I do it might cause a bigger problem, I'm giving out hints about it and try to inform her in a slow and unnoticeable way but her actions are too much to for us.

We tried to runaway instead, but it is impossible since we go to the same school and learn in the same classroom in the same class. we just endure it for 2 years, but a few of us took a hard college program and I don't think I can't survive this. she would always make me lower than her, but I want to change my character and make more friends, but she would get in my way, telling others about my flaws, and sometimes follows me

I want to get away form her, but I can't, I want her to change, but she shrugs off every insults, and only listens to praises... I no longer don't know what to do?

If she continues, I can't grow

First, I'm so sorry that you have to go through all that.
Depression is a serious issue but it can't be an excuse to treat others badly.
From what I've read, it seems like she doesn't want to be alone, and wants to keep things to her liking, that's why she's really controlling.
If you're her friend, or at least started out as a friend, you should confront her about it, and tell her your feelings. Find a good time so perhaps you both could open up and understand each other better.
But if it doesn't work out, you can tell the grownups or people that's she's willing to obey to, like your parents or the teachers. It might seems cowardly and uncool but you're still a teenager and it really is okay.
About her telling your flaws to other, i think people who genuinely wants to be your friend won't care about it, besides, everyone has their own flaws. I'm sure someone will understand.
That's all I can say for you, I hope things will work out for you and you'll be able to grow beautifully

Everyone involved is being a bad friend.

How is that for hard to swallow pills?

I know we're currently bad friends, that's why someone needs to do something about it, or else those times that we're still true will only go to waste. thanks for the advice, I'll try the first one as soon I get the chance

This reminds me of r/amitheantagonist in a way no offense but i think you should sit your friend group down and talk to them about this and your friend. If she doesn't comply you have to tell her you friendship relies on this and if they can't talk then this friendship is weak. I might sound like a monster when i say this but hear me out you have to say this where its if sje wont talk then you can't be friends. Its just the only way if she wont go peacefully. I think you just need to sit down with her and talk through the problems. Make her aware thats shes not acting good but she can improve. No, this talk wont solve everything instantly but its a start. I wish you a good luck in your endeavors for redeeming ur friend :3

Her whole attitude could just be a front. People who have depression and act all high and mighty are usually using that overconfidence and ego to hide behind a wall of confidence that they may lack. Sit her down and talk to her because you guys are being horrible friends. At the moment you're more of an issue than her.

dealing with depressants is really complex, but they can not just endure it.
According to my opinion, they should talk to the police or psychologists to prevent the problem from cresting