My family sucks

My mother and I have lived with my grandparents for my whole life. My dad left us and my mother didn’t have enough money to move out so we just stayed with them. Yeah, they helped support us, but that doesn’t take away from how horrible my grandpa is. I remember as a kid I got yelled at all the time and he would fuss about me being by him and so on and so on. The truth is that he didn’t like kids and he didn’t like the fact that my mom had me and that I had to live in HIS household (this comes up all the time). As I got older, our relationship got progressively worse. During my pre teen and teenage years he always judged me about the clothes that I wore and fussed about how I didn’t have a job yet (I was 15 and couldn’t get a job). I was just always being fussed at for something. In reality I was a good student at a private school, played sports, and had a good head on my shoulders. Immediately after high school I went to college (I’m still in college). He hates that. He thinks that college isn’t necessary and that I’m just wasting my time because he didn’t even finish high school.... I’m a 20 year old pre med student, and I receive nothing from them other than my room. But back to our relationship... About a year ago I was studying for a really hard micro class in which he came out of his room with a mean stare at me. I asked him was his problem was and we started yelling at each other. At the end of the argument he told me that I have some serious issues and then to kill myself. I tell my mom about every argument that we get in and it’s always my fault-including this one. Apparently he had no control but I’m sorry, you know when you tell somebody to kill themselves. I’ve never been suicidal, but that definitely hurt deep down. Now, I try to keep my mouth shut most of the time but he mumbles things when he’s in the kitchen with me and me being an assertive person, I want to know what he just had to say. Today, we yelled again. He’s been coughing for days, he’s 80, and needs to get over himself and go to the doctor for simple cough medicine. Anyways, he woke me up with a constant cough right outside of my bedroom at 5:30 am and continued on until I got up at 7:30 am to let him know that he woke me up. Heaven forbid that I say about how he was rude.. he begins yelling at me and I can hardly understand what he’s saying, and I yell back. Then he proceeds with a “you know what... you know what?”, stands up and starts coming after me. Finally my grandma comes out and tells st him because he’s being ridiculous. The problem is that these things happen on a regular basis and he is NEVER in the wrong because he’s old. I get yelled at all the time for these things and it’s not fair. He’s always reminding me of how I live in HIS house and how he doesn’t want me here, and how if I would just get a job (I have a part time job while I’m a full time student), and how I have problems, and so on. I’m over it...I can’t wait until he’s gone and it makes my whole family mad. But, to be talked to the way that he talks to me, I have no remorse for him anymore.