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Maybe I can't explain your circumstance, but I can second it.
I was very hairy as a child - front, back, arms, legs.  Kids called me 'Bear' - they told me that I was 'as hairy as a 'Bear'. I
I eventually had facial hair.  It began coming in when I was around age 22.  I went from clean to heavy shadow within months.
I often speculate if I would have dodged that 9 am shadow if I could have been on estrogen a year or so earlier.
Good thing was that estrogen seems to be what cleared my body hair.   It all began noticeably diminishing within a year of hormones and was all gone in less than a decade.  I have had no body hair to shave since late-1980s.
Of course I did require electrolysis for my face.  I went once or twice each month for one-hour sessions during eight years.  All gone.
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PS:. You can see my before and after pictures at 'Before & After  Topic v 3.0', Reply #1632 (or thereabouts if posts have been added or deleted.  (
https://www.susans.org/forums/index.php/topic,168444.1620.html’)
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