I don’t really feel comfortable in my own home

So my parents got divorced when I was 6 and so me (a boy) and my three sisters lived in our 4 bedroom house with my mom. My two older sisters were my half sisters and they are 9 and 14 years older than me. A couple years passed and everything was still fine and my mom and my dad were still technically married and saw each other often even though they weren’t living with each other. When I got into either 2nd or 3rd grade is when things seem to go downhill. My mother really had and still has a hard time saying no to people. And when she does no one really takes her seriously. She’s very nice to everyone but that can sometimes be her weakness as people really have taken advantage of her. She’s been in 3 marriages and had 3 divorces as well as other failed relationships in between. She struggles with a.d.d. and somewhat depression it seems at times. Around 2nd or 3rd grade my oldest sister had her ex boyfriends brother live on our couch as he had nowhere to live and my mom couldn’t say no. Then my oldest sisters boyfriend started being here and spending the night here all the time. Then my 2nd oldest sisters boyfriend too. Then she brought two cats to the house who had more cats until we had 21 cats total (mostly kittens) running around the house, going to the bathroom in and tearing up the carpet. We slowly gave them all away but the damage is permanent. Despite all these almost 20 year old men living here, no one cut the grass. My dad did for years but not with all these people here. My grandpa came to check on the house and saw what’s going on and he lost it. Yelling and cussing at my sisters boyfriends. This was one of the scariest things I’d ever seen as my grandpa is a super Christian man and goes to church every Sunday and tries his hardest to be the best person he can be. He was apologizing to me for acting like that a few minutes later. Eventually everybody moved out, but by 6th grade the next menace of my life moved in. My moms boyfriend who was a drunk, very ignorant, annoying, hard to understand, and very bad at cooking. He would insult us all the time for the way we lived and many nights he would argue with my mom and she would have bruises on her arms that she claims weren’t from him. One night he threw a bowl at her head and missed so my mom took me, picked up my sister from her friends house and then called him and threatened to call the cops. He left and we went back inside. He lived with us from 6th grade to the beginning of 9th grade. He caused major disruptions between the family, causing my sister to move in with my dad and making me want to, but I never could leave my mom. My freshman year of high school my life was pretty good. My sister had moved back in by then, my older sisters have their own apartments or working abroad, and although there were stains around the house from the cats years ago, it wasn’t very noticeable. Our garage and my room were absolute disasters though. My room would remain horribly dirty from 8th grade to the summer after 11th grade. In 9th grade I also began taking guitar class. I also got a cat that I believed was the one thing that would make me happy. He was pretty derpy and skiddish but a good cat nonetheless. He did scratch at furniture which made the house look a lot worse. Then my sisters dog moved in with us. My sister would eventually move back in with my dad, and then my older sisters, and with her friends and wherever. Couldn’t stay happy in one place until recently at my dads house. But her dog stayed here and she gets hair everywhere. And then my 2nd oldest sister had a baby and got married and moved to Florida (I live in Georgia) and sent her dog to live with us now. We also got another cat from a lady around the corner as my mom thought it would be taken to the pound and killed if we didn’t get it. He is a very good cat but he gets a lot of hair everywhere and scratches at things sometimes. Now we have 4 animals living here and it’s just me and my mom. The first cat we got goes to the bathroom on the floor where the old kittens did many years ago. Even when we clean out his litter box very often he still does it. It makes out house smell awful and it’s gross to walk around. I don’t feel comfortable having my friends over and I could never bring my girlfriend over here. I’m just embarrassed to live like this. The grass is getting long again, the floors are getting worse, and things are getting more messy. The kitchen floors are coming up and the back yard is so unkept. The carpet under every door is torn to hell and the corners of the carpet in the hallway are just disgusting. Our garage is filled with junk and so is our attic and a bedroom. My mom has no motivation or money to do anything about it and to be honest I don’t have much motivation either, I don’t even know where I’d start. I’d like to get new floors but it’s too expensive for my mom to get and what’s to say the cats won’t do the same thing again. Also the couches and carpet is just filled with dog and cat hair. It’s absolutely insane. I’m now 17 and going to graduate high school in May. I guess I’m gonna move out of this house and live in an apartment or something but I feel bad leaving my mom here. I don’t really feel comfortable living here for the time being and don’t really think it’s very hygienic. I just am so lost as to what to do.