I'm sorry if this makes you question your identity.
About ten years ago, I had a similar life-changing discovery...
Since high school, I believed I was 6'2''. In choir, my teacher measured us, so that we could stand according to height. 6'2''. I believed that. I put it on my drivers license. I told my friends, family- even my WIFE I was 6'2''. Then... one day, at a routine doctors appointment, I found out I wasn't even quite 6'1''. I'd been living a lie!
I know a good therapist if you need one. 🙂