Please help!

Okay this is gonna be a long story so please bare with me! Basically I'm 21 years old I live at home with my mum dad sister and brothers , I am the second oldest after my sister. I believe that my father my emotionally abuse me and my siblings but mainly me. He often puts us all down, he is very stressed all the time. However he has recently taken early retirement so I thought he would calm down. I need to let you know and bare this in mind throughout: SOMETIMES WE DO GET ON, WE DONT FIGHT CONSTANTLY, WE SOMETIMES GET ON! However I'm one to hold I grudge so I always remember how I was once treated... I'll get into it properly now... basically my dad is a very stressy person, when he is stressed either at us or not, he will take it out on us. He often calls me "$#%^" and says that I'm a waste of space etc. He says this to all of us, but I can tell he has a real problem with me. Going back to when I was younger before I was 16, from the age of around 7 I remember he was stressed and maybe I was annoying him while playing and he lifted me up by my arm and I remember it really hurt, since then he would maybe smack us a little if we were "naughty" when I was around 16 I started seeing a boy who my parents eventually hated, it meant I snuck out of the house to see him, which I know is bad but I loved him, (I am not seeing him anymore as he treated me like $#%^ but he was my first love) so when I was 16 I liked to go to party's and see this boy sometimes, my parents would see that as being bad so my dad would sometimes hit me, never in the face but on arms and legs, or grab me, I used to get really big bruises. Also when I was around 15 I had an eating disorder which I've had all my life it's called "pica" which means you eat things that aren't food so maybe clothing or materials in the house( I know this sounds so weird for people who don't know what this is but it's a serious illness!) so my dad would hit me for eating the carpet (don't laugh I know it's weird) I did it since as long as I can remember I was addicted and couldn't help it, so it left holes and my dad hit me for it. I have since got my eating disorder under control. So again when I was 16-17 I used to have my phone converscatwd from me as I would text the boy, or be "naughty" . I have since grown up more since then and I have a boyfriend of 3 and a half years, who they like so I think that's why they aren't as harsh on me. However my dad gives out emotional abuse, he does NOT hit me anymore or grab me. Whenever he is stressed he says "why are you all wank" and he will pick you a part and say stuff about you. He said to me yesterday that I'm scared of my own shadow even though I'm not that kind of person anymore. I think when growing up you think your parents are always right however I can now see that they aren't. I used to believe him and think I am $#%^. Now I think he's an idiot. My mum is okay most of the time but sometimes just goes along with my dad. I can hear them sometimes at night bitching about me through the walls. I am at university and will be starting my final year in September, I have always had jobs over summer however last year I was working 6 days a week and it took it out of me. This year I have decided to not get a job which my dad HATES purely coz he wants me out of his way, even though he knows I hated my last job, he would rather me be miserable working a rubbish part time job. I have enough money myself from my student loan for things for myself. My dad strongly believes that because he is my father and I live under his roof, we should treat him like a king and constantly be thinking oh dad looks stressed let me make him a drink or oh I'll do that, even though we are just humans at the end of the day and can't think of everything: I do try my best, I never purposefully cause him agro. I try to stay out of his way. The latest argument is this: basically my sister has a flat for uni an hours drive away but she is going on holiday with my parents and said I can use it next weekend with my boyfriend, however she then said can u stay on the Tuesday as well when your boyfriend goes home to wait in for the wifi. Then your boyfriend can pick you up later. I know for a fact my boyfriend wouldn't want to keep driving back and forth to the flat (he works) and I'd have to wait in all day for the wifi man! I know she wouldn't do it for me! (It's more complicated than it sounds) I said she should get it installed early September when she's home but she says no I'll be in uni and will need wifi! She won't need wifi right away and she will have a spare amount of time to get it sorted! Anyway I've said I don't want to stay in her flat at all now and neither does my boyfriend! My boyfriend kinda hates my family coz they make me down all the time and cause me stress. My dad was stressing at me coz I said I wouldn't do it, he said I'm $#%^ and scared of my own shadow and can't do anything. He said I'm incapable of walking down the road to get the train to the flat "which would take me 3 hours to get there! If not more actually!" I know my dad wouldn't do it either!! But he's on holiday then. My sisters horrible to me too, she almost bullies me! It's a dysfunctional family. My brothers are okay but are treated like golden child's, which isn't fair, my sister doesn't get as much abuse as me either! Would love some advice and support! Thank you xxz