Idk if I should really post this here, but kind of desperate to have some kind of outside opinion, whilst being anonymous.
When I was around 11/12 my brother (4 years older than me) became very very mentally unwell, to the point of being e.g. not going to school properly for a few years. It was initially diagnosed as anxiety (he has suffered quite a lot of bullying), although a few years ago he received the diagnosis of OCD.
A lot of my early adolescence teen years were spent essentially waiting in cars whilst we went place to place in an effort to find therapy which suited him.
But the thing is, he very rapidly became quite aggressive towards me, e.g. he would put me down, call me a 'bitch' or a 'cunt' (as well as other things), and I'd be made to apologise for 'provoking' him (usually because I had disagreed with him). It got to the point where even his own friends would comment on how mean he was to me. It escalated to full delusions about me, that I was satanic, that I was performing black magic on him to remove his intelligence, that I was poisoning him to chemically castrate him. He would growl at me, spit at me, shake his fist at me, and threaten to kill me regularly (like for 2 years on a daily basis). My parents would always say to me 'don't be upset by it, he can't help it, it's his OCD' etc etc, and my mum always, and continues to do this, compares how much 'better' my life is than my brother's - as a reason why I shouldn't talk about my achievements or life, in his presence (I don't anymore, he still becomes violent and aggressive). (Context: I have always excelled in school, straight A* student etc, have a good, reliable circle of friends - who tbh kind of became my substitute family because no one in my family really had time for me - to the point that it was my friends who called the ambulance when I took a potentially life-threatening overdose, and not my mum who was in the car with me). On top of this, there have been occasions where my brother has been physically aggressive towards me, punching me, pushing me to ground once, pulling my hair, scratching me, and grabbing my throat with two hands on at least 2 occasions saying he was going to strangle me, before my parents intervened.
When I got into Oxford on receiving my A Level results, I spent the month and a half before I moved out hearing graphic descriptions of how I would be raped and beheaded, again pretty much daily, because he had been 'humiliated' apparently.
(Other context, don't want to dripfeed, when I was 16 my personal longstanding MH issues came to a crisis point and I was admitted for 2 1/2 months as a psychiatric inpatient) (Throughout my teens, I was self-harming on a daily basis, 4 or 5 times a day for a few years, as well as having periods of heavily disordered eating) (I am also diagnosed as being on autistic spectrum)
But basically when my mum speaks of this period now, she justifies it by saying that my brother 'doesn't annoy me anymore', (leaving out the fact that I am still basically not allowed to talk about anything in front of him), and that he has very severe special needs, unlike me, because I am more independent.
But like, I just feel so messed up about this so frequently and I always feel guilty because apparently my life has been so much better, idk