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Confidence is a reduction of your own interest in whether others are thinking about you and if so, what they're thinking.

Augusten Burroughs (2012). “This Is How: Proven Aid in Overcoming Shyness, Molestation, Fatness, Spinsterhood, Grief, Disease, Lushery, Decrepitude & More. For Young and Old Alike.”, p.60, Macmillan
Confidence is a reduction of your own interest in whether others are thinking about you and if so, what they're thinking.