Can't get along with Parents.

So, to preface, Mental Illness runs in my family. Addiction, depression, narcissism, etc.

I'm diagnosed with Autism (not mental illness but still), BPD and a number of anxiety disorders.

I simply cannot get along with my parents. My dad's a narcissist, his idea of love is treating us like property, treating us as if we are 5, and then buying us things. My mum is consistently angry. She blows up at the smallest of things. I can imagine this is my dad's fault, he isnt very nice to her. But somehow she will always take his side if I say anything to him. 

Anyway, my mum is always angry. makes the biggest deals out of everything and if she is in a bad mood, everyone has to be. She doesn't get much help from my brothers, and im sick of being the only one who helps with anything.

I can't have a single conversation with them without an argument. It makes me feel so horrible. My mum has so much sympathy for others but none for me. Before school one day about 5 years ago, I had a panic attack and couldnt get on my school bus. she stood there shouting at me.

Suddenly, two weeks ago, her friends daughter is struggling to go to school due to anxiety. she was 'so worried' about her. but why not me? why is my struggle not enough?

Even through self harm, panic attacks, s*icidal thoughts, diagnoses etc, she still wont believe I have any mental illnesses. she just doesnt and wont accept it. I haven't even told her I'm diagnosed with autism since she would laugh and not believe me anyway.

It makes me so so upset. Im so jealous of people who have good relationships with their parents. Why am I not enough?