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It's not just about being ashamed of your family every time you see them in numbers.
There is something darker going on; the shattering of the illusion that seems to sour most experiences after the age of 8.
Marriage, sex, having children, finding a job; we look forward to all of those things as young people, only to end up sick, disillusioned and often in tears minutes after each of them finally occurs.
Here's something else to look forward to: David Walliams, who still warms the heart for his work in Little Britain, has turned his amusing children's book Gangsta Granny into a television special, and UKTV is running it at 7pm on Christmas Eve.
On Christmas Eve, there is still time; we can hope against hope that this year, somehow, things will be different.
And Gangsta Granny might be just the thing to keep reality in check for its one hour and seven minutes' running time.
Gangsta Granny follows schoolboy Ben's (Reece Buttery) discovery his Gran (Julia McKenzie, Miss Marple) is not the deeply boring elderly person he thought she was.
She is, in fact, a jewel thief.
Gangsta Granny is directed by Matt Lipsey, who also directed the irredeemably dark Psychoville, a television highlight of the 21st century.
Walliams and Miranda Hart (she has a sitcom called Miranda, but is quite funny in this) are Ben's ghastly parents, who drop him off at his Gran's so they can indulge, sequin spangled, in ballroom dancing.
Worse, they are addicted to Strictly Come Dancing.
Ben's dream is to one day become a plumber, and to that end he has a subscription to Plumbers Weekly, which comes with a free S-bend.
''I want to be a plumber when I grow up,'' he says.
Ben's visits to his Gran's are painful affairs, complete with lashings of hot cabbage soup, which his Gran slurps loudly at the dinner table, followed by a main course of cabbage pie with boiled cabbage on the side.
Apart from slurping, Gran farts, snores loudly, makes unpleasant sucking noises while eating boiled lollies, and gets 87 points at Scrabble for the word ''cabbages''.
But Ben soon uncovers her secret double life, gets to hear her incredible story and embarks on a wild adventure involving the Crown jewels.
Gangsta Granny is gently amusing, and also features the very amusing Rob Brydon, as well as Robbie Williams and Joanna Lumley (who was great in The Wolf of Wall Street).
- Charles Loughrey