--No longer having any friends, wish I'd kept in touch with the ones I had.
--Not training for a well paid career when I was young so now in middle age I have to scratch around for money.
--Not being able to have more children.
--Marrying into a family of cold, unfriendly people instead of the warm welcoming family I hoped for.
--Moving to this unfriendly village 20+ years ago instead of somewhere more lively and open minded.
(I tried to make that into a list but the formatting didn't work)
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That alien woman. On Earth to observe and wonder about homo sapiens.