How do I even know what my mask looks like?

I got diagnosed with autism at the age of 38 at the beginning of this year. And at 39 for ADHD a few days back. I am assuming I have been masking which is why no one has ever even considered the possibility I might be autistic / adhd in my late 30s. And if I have been masking, how do I know when I'm masking and what's real?

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