So, a little bit of context to start with. I (16FTM) don’t have a job, despite having looked for months. I live with my mum in a small town with mostly family-run businesses. I don’t have a car, meaning any I job I get has to be walking-distance from my house — my mum works 45 hours a week plus weekends so cannot drive me anywhere, public transport is expensive and ridiculously unreliable. I get $20 a week for pocket money, however this particular week I’d spent the majority of it on school things and new socks because I didn’t have any good ones. I have my learner’s driver’s license but can do the test for the next level up, but I still won’t have a car to drive.

My sister (21F) has a full time job, lives in a flat with 5 other people, and has her own car. She got her car 3 months before she got her license and it was fully paid for by my mum. She learned to drive in her own car and got all stages of her license on the first test. My sister does have to pay rent, groceries, bills, etc, but she spends most of her money on concerts, eating out, clubbing and other luxuries, then relies on my mum to give her money for food and other necessities.

Now, the actual problem. This morning, my sister had invited me to go out for lunch with her. I hadn’t had any breakfast as we don’t really have much food in the house, and I was excited to eat out for once in a while. When we get there, I asked my sister if she could possibly pay for my food, as I had less than $5 and couldn’t afford anything in the place she picked as it was quite a fancy place. I figured she would pay anyway because she offered me to go with her.

After I asked her, she looked at me and said “I literally only have $2 in my account. You should’ve saved your pocket money, it’s your own fault”. I guess that’s kind of fair however I was paying for things I kind of needed for school.

So I said “Okay I won’t have anything then”, I was mostly just happy to be out of the house. That’s when I heard her ordering a mince and cheese pie, a slice of cake, a chocolate frappe and a brownie.

I literally could hardly say anything, her total came out to be almost $30. Then I lost my temper and just yelled at her, calling her a selfish bitch, and I stormed out of the cafe. I just walked all the way home, even though it was pouring rain.

My mum apparently heard of this and this evening, she told me that my reaction was completely irrational and that I needed to apologise to my sister, which I didn’t do. I still haven’t talked to her.

Am I the asshole? Should I apologise?