AITAH here?

for context, I am 16M my father passed away when I was 10, I have a twin brother and my mother, we live together, the thing is, everyone for some reason sees my (twin)brother as the big brother, this really pisses me of, as I always consider us both to be brothers not elder or anything, now someone came to our house (friend of my mother or something idk) and just gave a lot of "gyan" and left, on of the stuff she said was she asked my mother who is elder among us two (which I really hate) and my mother replied my brother, even tho she knows that I dont like it, that person said of lot of things like how you need to stand on your feet, you have no father so you must be strong blah blah, and then that person just said to my brother that "**since you are the big brother you must keep you brother under your control, and you need to be the umbrella and the big man of the family**" this really REALLY pissed me off, I always thought of my brother and me as equal, and always made clear to both my brother and my mother that I dont like being called the smaller brother and stuff, and when that person said to my brother that you must have control over your smaller brother(me) I was MAD. when my brother left for accounts tuition I confronted my mother about this cause I dint want my brother to hear all this, want thing I also want you to know is my mother is old and just recovered from a bile duct stone operation (around 3 months ago), I used to have a little anger issues as a kid but since the last years or few years I promised my self to never yell or shout or be angry and just control and keep it buried in me cause my mother is old and not the strongest so it might hurt her and I dont want that, my mother is the only thing i have in life, i dont want her to get hurt, but this time due to that persons statements and my mother keep adressing my TWIN brother as my big brother I snaped and kind of told her things like **"you dont love me, you love my brother more"** **"you dont see me and my brother equally"** and stuff like that (deep down I know thats not true and she love me a lot, I do too I would destroy the fucking world for her) and I felt like it hurt her, now after the little confrontation. I feel like it might have hurt my mothers feelings a little bit by the things I said in the mist of anger, tho right now maybe an hour after our "fight" we are litterely back to normal, I have never and NEVER yelled at her in the last few years, and today marks the day I broke the promise I made to my self, I feel terrable, I feel absolutely sick of my self, I dont want her to feel bad, and am feeling really guilty after that, and just wanted to share this off of my chest on my throwaway account, Thanks if you read all of my emotional dumping here I have no one else to share with🙏.