I think the only reason I don't get bullied is that I'm the tallest person in my grade but other than that if I wasn't and people knew what's wrong with my brain, 100% I'd get bullied and sry bro about your parents and brothers but at some point, you need to tell your brother just to help a little bit. at first, you can just ask him once every couple of days to do something simple and try to build a better relationship with him and he'll start helping you more. that's what I did with both of my sisters. for the first 12 years of my life, we hated each other and even if a accidentally touched them they would yell that I punched him but I just didn't talk to them for like a month unless they asked me something then I started asking them how their day was and that slowly started building into a conversation even if it was always through text. still, after a while, I don't talk to really anyone in my family just so i don't get mad at them and they start hating me again. this kind helped for me hope it helps for you.