Is it too weird to be mad that my family doesn't pick up after themselves?

I came home after being gone for 6 days because I was at my cousins house for the millionth time. And I was so fucking pissed when I got back. The sink was full of dishes, chip bags left out instead of being in the box with the other chips, empty snack boxes on the table, and two bags full of trash on the floor.

The trash bags pissed me off but I slightly excused it because my cousin was going to take it out, but judt seeing it there made me think that someone just bagged two full bags of trash and just left them there which almost made me take out the trash.

There was a cup that had some juice in it on the counter, a box with some fast food, and some other bullshit. I learned to just let them clean up after themselves because they're grown adults, but it makes me insanely angry to be gone for just 6 days, come home, and be pissed off immediately.

And when I got to my room, it wasn't any better, my mom had been on my laptop, (Which isn't a problem) but she had unwrapped my mouse, and keyboard without putting it back how she originally found it. So my keyboard was in my bed, and my mouse was unwrapped and still on my desk, and my charger which was originally wrapped aswell was unwrapped and plugged into the wall and keyboard. And this isn't even her first time doing this! She would come into my room while I'm gone, use my laptop, shut it, then not put anything back to where she found it. There was a time where I found a Pepsi can in my room and was confused until I realized that my mom must've came in my room and used my laptop, and just had a drink while being in my room.

I don't know, I just wish that the people around me picked up around themselves more. GROWN ASS ADULTS can't pick up after themselves, but a teenager can? Pathetic. I've seen CUPS left out for days by grown ass adults.

And even at my cousins house, I couldn't escape it. (Kinda) it's much neater which makes me happy whic his a big reason I go there in the first place, since my auntie doesn't allow for my cousins to eat in anywhere but the kitchen since she knows they aren't responsible when it comes to food. And you know what? Hell yeah. But when I went in mt cousins room, I found a cup of oreos just.. on their table? I was confused, but, whatever. They can get in trouble for that. And when i was about to go to bed, a bottle of sparkling water was on their bed and was leaking, so i had to put a sheet on the spot where the water was. The cup of oreos was still there when I left.

​​I just really hate it when people take 3 sips of something, or 3 bites of food, leave it in somewhere like the kitchen or living room for several hours, then come back, eat it, and just leave it there for someone else to get. I really just want my own place so I can keep it really neat and clean.