My best friend is having a rough time rn. She always tells me it's ok if I cant help her or be with her when she feels bad because of my own problems or thoughts. 

But then, I feel so damn useless. I can't help myself, I don't enjoy anything anymore, I do nothing with my life - and now I can't even help my best friend and push through my thoughts in order to help her. I feel like i fail her. And she won't say it, she will deny it, she says it's ok. It doesn't help me feel like im not an utter failure for not being able to do anything.