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The original was posted on /r/AmItheAsshole by /u/a_ho1234 on 2023-09-30 18:00:11.

I (F29) have my own apartment and live alone. I have a lock on my door that has a code to unlock it. My family has watched my pets previously and I created a new code for them to use. I didn’t delete it as I didn’t see the reason, but after this it’s gone.

Today I was home just relaxing in my bed. I was watching series on my computer with noise cancelling headphones in.

Suddenly I see someone in my side vision and screamed. My sister (F26) is standing in my doorway in to my bedroom. I was so sure someone broke in to my apartment and I almost started crying in panic.

She had just put the code in and walked though my apartment just to ask if she could barrow an A4 paper.

In my fit of panic and rage I screamed for her to leave my apartment and never ever do that again. I said she could have texted or called before, and when/if she knocks on the door and no one answers, she is never allowed to just walk in.

My sister lives down the street, and when she got home, she called our mum and she berated me for screaming at my sister and not giving her an A4 sheet. I disagree since it’s common sense to not just walk in to people’s apartments when they don’t know.

So AITA for screaming at my sister and not giving her the A4 paper?