AITA for being harsh with my mother and her family

I (19F) my half sister is (13F) my mom cheated on my dad with her dad when I was 2 months and they got divorced and she’s got pregnant with her immediately my dad has primary custody of me and my mom moved to another country with her new family my dad never remarried but he had my 4 sisters how are convinced by surrogacy (18) (17) (16) (15) my dad is professor and my mom husband is business man I guess this is why she left us even though my dad isn’t poor we are rich but not on their level I grew up with my dad and my 4 sisters and my mother would fly and see me every few months and 2 weeks in summer I never felt like I’m part of their family I always felt like a guest her husband and daughter seems nice but you can always feel the tensions I never spend any holidays with them my mom never showed up to any school stuff of my events since she lives in another country so here’s the deal I graduated in 2020 (2 years early also I was born in December) the plan was I was supposed to go college a year and half later where my mom and her family lives but before I graduated and the pandemic hit me and my dad decided I will continue my study in my country and be close to my family this decision was because I truly want to be close to my family and friends also my nanny how helped raised me and I was so young we didn’t tell my mom we thought maybe it will upset her so we moved on from it . in late December she came and visited me I had a online class that day so when I told her and explained to her everything she was sad not angry or anything but I can feel she was disappointed after she left I got a call from her husband which I was surprised he told me why didn’t I stick up to the plan I made my mother sad the whole Christmas weekend it was bad and my dad took the phone and handled everything I was in rage how dare they act like I owed this to them I called my mother and everything inside I told her about all these years of resentment cheating on my dad leaving the country when I was months old how dare she act like she care about me in the end I told her to never contact me ever again she tried the past 4 years to talk she even came with her husband sometimes with their daughter she gave my dad letter she worte a month ago she was basically saying she was sorry that leaving the country because her husband visa was revoked so she has to leave she said my dad refused to fly me to her or let someone take me she also said she always think about me she even have a room for me she decorated for me in 2019 how she was excited that I’m gonna spent 4 years with them and her to little girls are going to bond how she wishes things were different and she can ow dare she act like she care about me in the end I told her to never contact me ever again she tried the past 4 years to talk she even came with her husband sometimes with their daughter she gave my dad letter she worte a month ago she was basically saying she was sorry that leaving the country because her husband visa was revoked so she has to leave she said my dad refused to fly me to her or let someone take me she also said she always think about me she even have a room for me she decorated for me in 2019 how she was excited that I’m gonna spent 4 years with them and her to little girls are going to bond how she wishes things were different and she can change it and she hopes I’m up to reconnected with her and forgive her my dad said it’s up to me and my sisters thinks it’s wast of time to talk to her again when we even don’t live in same country my dad disagree he says now that I’m adult I can fly to her and see her but to be honest I don’t want that I study in asian country and my family lives in another continent and my mother and her family lives in another continent I feel like even if we talked again things will be the same I will alwa be second place in her life so AITA here. ?