AITA for getting mad at my brother?

So, I still live with my parents, and so does my brother. We’ve shared a room my entire life, which means sharing a desk, sharing a TV, and sharing a dresser. But, because I’m younger, he will use his “older sibling eminent domain” bullshit and say “Oh I get to use the desk now because it was mine before you came along.” Well, recently (as in about 3 years) I’ve been going from 0 to 100 very quickly when he uses my shit or eats my food.

1. I got a pair of Beats for my birthday a few years back. Before I started hiding them from him, he would pop them on whenever he wanted.

2. I saved up money from doing chores and bought myself a nice belt, which he proceeded to use whenever he felt like it. A time when I had a date comes to mind, and I couldn’t find my belt because he had a job interview.

3. I have a Rubix cube that I managed to solve. One day, I looked at it and noticed black dots (in PERMANTENT FUCKING MARKER) in the middle of all the white squares. He swears he didn’t do it, but, unless our dog figured out how to uncap a marker, find the white spots on the cube, and place a single dot in them, it was him.

4. Ever since I got a job, I’ll buy my (for lack of a better term) pleasure foods myself. I don’t like asking my parents to pick up Cheetos or Pepsi for me, so I buy them with my own money. He will eat my Cheetos and drink my Pepsi whenever he wants, despite him ALSO having a job.

5. I have a pair of flip flops. He also has a pair of flip flops. Our room on his side is so messy and disorganized that he cannot find them and uses mine.

6. We have two vehicles. I take one to school when I have class. Sometimes, he will put the keys in his pocket and not on the thing where we hang out keys, and then I can’t find them. He has made me late to class MULTIPLE TIMES because we only have one parking permit. In the one vehicle.

Those are the ones coming off the top of my head. He gets pissed at me whenever I bring these points up, however. So, am I the asshole for getting pissed at him?

EDIT: Yes, I have tried talking to him. I tried to remain calm, I asked him very kindly to not use my shit, but he’ll goad me into shouting at him to “shut the fuck up” (yelled that at him in front of our mother). A time that stands out is when I was asking him to take his discs out of my PS4, and he would constantly respond with “bless you my child”. For about a half and hour.