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The original was posted on /r/AmItheAsshole by /u/discont_waffles on 2023-09-20 20:00:52.

So I am an only child by mom and dad, they were never married and didnt really date when I was born but they are still friends to this day. My mom met my stepdad when I was like 4 or 5 and they dated for a LONG time, they didnt get married till I was almost 10 lol. He had 2 daughters around my age, one was basically the same age as me and the other being about 2 years older than both of us. We all moved into a new place, it isnt the biggest so me and the younger stepsister had to share a room.

Maybe its just my own weird issues but I never really felt like I "belong" with them. I want to say that they were never ever once mean to me or bullied me but I always got the sense that I was just an "add on" if that makes any sense. Me and the one I shared a room with fought quite a bit but that was more in the past and we've been good for about a year. I know they never had any responsibility for me to not feel this way but deep down I always felt left out in a way.

Me and the one I share a room with are entering senior year of HS and the oldest is going into her 2nd year of college. While at home I was on the phone with my friends and a couple new people that have been added to the group if that makes sense. IDK why but one asked if I had any siblings and I said no and that im an only child. It didnt even cross my mind that my stepsister was also in our room and was reading. I looked up at her and I am pretty sure she heard what I said but she didnt looked phased at all and kept reading.

After I was done I guess my mom heard what I said (our door was open) and wasnt too pleased. She made me apologize to my stepsister who seemed to not really care and gave me this whole lecture about how its rude of me to be so cold to people ive known longer than I haven't. I am wondering if what I did was wrong. So AITA?