Can I be someone I am not?

I am really struggling with this. One of my close friends has some issues right now and we seem to have alot of tension. So I want to bite my lip and say I am sorry even if I have nothing to be sorry for. But thats not me! I can't bring myself to do it. Even though I know she's having issues and taking it out on me. I am not used to backing down and apologizing for nothing.