My brother is disgusting.I don't even want to think of him as my brother.I suspect he probably has some kind of disability, but even so, I can't stand him.I'm currently a high school senior (12th grade), and my brother is two years older (second year in university).He's always had personality issues.What I find clearly abnormal is how he doesn't care about his appearance or what others think at all. When talking to people, he completely fails to read the room and starts talking about something else (and that topic is also completely incoherent, so you can't tell what he's trying to say). He repeats things I've told him to stop countless times. He steals money from our parents and me (he's been scolded so many times for it, but he doesn't stop). The list goes on and on. Lately, I've hated talking to him so much I've been avoiding speaking to him altogether.Even though he's a college student, he's never had a part-time job and has absolutely no friends. It seems like when he's not at university, he just stays home eating snacks and staring at his computer...The first time I felt creeped out was definitely around second or third grade. I'd just gotten out of the bath and was naked when my brother stared intently at my crotch. After that, I stopped showing him my naked body entirely.Also, around eighth grade, when two male cousins my age came to stay over,my brother suggested to them, “Let's go take off ○○'s (my) clothes.” My cousins came and told me about it.In front of my cousins, I jokingly responded, but inside, it made me feel sick to my stomach.He also tried to get our family dog to lick his crotch (I happened to come home early and caught him), and he'd take off the clothes from my old Licca doll and hide them in his room.And recently, it seems he repeatedly entered my room while I was out studying or otherwise away, sniffing my bed.There wasn't any evidence of him doing those specific things, but I discovered he had been in my bed.I feel so sick, so utterly sick, I can't process my feelings.When I asked why he did it, he said he was just curious.I'm his real sister, but this is truly unbelievable.If he just didn't talk to me or interact with me, I could have endured sharing the house. But he actually did things that made me feel sick, and I've truly reached my limit. I seriously wish he would just die. She doesn't earn money, steals from others, is disgusting, and just eats all the time – he's nothing but harmful. I still can't leave home, and I genuinely want to kill him.I'm sorry for the long, messy post... What should I do...?