Standing Up For Oneself

My friend just gave me a "pep talk" on standing up for myself and others. She says it wrong and to just leave it be. Well if you leave it be, it'll get worse. It might get worse if you stand up for the cause but at least your brave enough to go through with it even if you know the outcome. 
"Courage is not a man with a gun in his hand. It's knowing you're licked before you begin but you begin anyway and you see it through no matter what. You rarely win, but sometimes you do." - spoken by Atticus Finch, by Harper Lee, To Kill a Mockingbird.
I just gained confidence in math. Now, I'm loosing all confidence. My friends and I have been having fights on a daily basis, even when we don't see each other!
How could I know if she's trying to push me away. She says she's faking her friendship with another girl, but isn't that bullying? And she's been saying how she hates how the other girls are bullies. And what if she's lying to me?
That's why I haven't posted art. I've lost confidence.