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Have you ever felt alone even when you were surrounded by friends?

Have you ever felt alone even when you were surrounded by friends?
Friends, or other people in general.
To me it happens sometimes, but the worst time was in Budapest a couple of years ago.
It was raining incessantly so we couldn't go out, and many of my colleagues scattered in the Spa and pool/termal baths of the hotel.
That night there was the party and even though I was talking and smiling with other people, I just felt so isolated and alone.
What about you?
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I apologize for not having followed this question up until now, I was KO because I got a fever after getting my vaccine.

Getting back to the question, thank you all for your answers and opinions! I admit I didn't realize how common it was to feel like this. Thanks for sharing all your experiences, I wholeheartedly appreciate them!
Have you ever felt alone even when you were surrounded by friends?
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