Pretty normal. Happy people want someone to share their happiness; unhappy people want someone to commiserate with.
On top of that, happiness has a stamp of social approval. We're supposed to smile and laugh and be happy. Unhappiness is stigmatized, something we're not supposed to do or feel or God forbid show.
So on top of feeling miserable, you feel guilty for feeling miserable. Which makes you more miserable.
I once ran out of a restaurant and hid in the woods on Mother's Day.
.
Why??
Because I was miserably depressed, and heavily medicated, and my kids were coloring on the table, and I couldn't think of a single happy, perky, cheerful thing to say. And I looked around the restaurant, and say all the other happy, laughing, chit-chatting people, who probably had their own problems and were probably miserable inside, but goddamn good and well had the wherewithal to paste on a smile, force a laugh, and make people believe it.
And I realized, in that moment, that I was completely inadequate as a wife, a mother, and grand-daughter, and a human being. I realized that my family would be better off without me. I took $500 out of the bank, bought a sleeping bag and a single-burner multi-fuel stove and a two-man tent at WalMart, and disappeared into the woods. I made it about 2 miles before my husband realized I wasn't out smoking a cigarette and called the cops to come track me down and drag me home.
To this day, I don't know if he merely feels responsible for me, if he's terrified of raising these kids alone, or if he values me a lot more than I value myself.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"