Is OTHER wrong in the post ? POST : Buckle up, y'all, there's a lot of shit to unpack here.

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So this all started when I came home for winter break from college to find that my dad's girlfriend, who I've only known about six months, and her 6 and 9 year old kids had moved in. No one told me this information beforehand, so it was a surprise to find mine and my sister's belongings in bags and her kids living in our rooms. My dad turned the office into a bedroom for me and the guest room a bedroom for my sister, but it was still a huge shock to come home to. 

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I've been having a really hard time with all of this. I don't know his girlfriend very well and her kids make the house feel constantly chaotic. They've been trying to plan a lot of outings for her and her kids and my family (I also have a 10 year old brother and an 18 year old sister), and every single time it ends with someone upset or a fight between two people. Our families haven't been meshing well at all. On top of all of this, my dad has been extremely distant. I've tried to voice my feelings and he just won't listen. We haven't had a real conversation since I got home, even though I've tried time and time again. I even had to come home to find that my pony and my goat had both died and he just didn't think to tell me. 

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Finally today I lost it and went off at him when he told me he was fed up with my attitude since I came home. I started listing things like no one telling me she moved in, him being distant and not actually talking to me, constant chaos and stress in the house. I also mentioned that it felt way too forced when we all went out and I'm not interested in doing things the seven of us until I feel comfortable and ready, which he didn't like at all. I ended the fight by saying "if I had a car I wouldn't be here right now" and to that he just walked away. 

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I kind of feel like an asshole because this is my dad's life and I should have respect for it, but on the other hand, I don't understand how someone I talk on the phone with everyday could make so many big decisions and completely leave me out of them. I've felt awkward in my own home for two weeks now, everyone is stressed all the time and it's starting to affect my (very fragile) mental state. No amount of voicing my feelings has come to any actual meaningful discussion. I'm supposed to be here until January 5th and I don't know if I'm going to make it. I'm genuinely not ready to welcome these three new people into my life. I will be one day, but right now this has all been too quick and it has affected me very badly. Am I a selfish asshole, or am I justified in my feelings? 