I’m sure it’s quite common for NT people to vary their personality to suit the occasion too but ASD masking is more than just slight personality changes and requires huge effort and energy to sustain.
I didn’t overcome masking. I did really well juggling masks in early high school but it requires more and more effort as you get older while constantly grinding you down, which limits your ability to juggle masks at which point things start to collapse and you burnout. I ended up in hospital then moved out to a remote bushland location to become a hermit.
Go and see a healthcare professional if you are struggling. Diving in and taking your mental health seriously is really the only thing that will start you on the path to recovery.