Means: to be the outcast, odd one out, unlike the others
You can use the phrase “Black Sheep” when describing someone who acts differently than the expected norm. It’s usually used in conjunction with “family” as in he’s the black sheep of the family.
Example of use: Rachel is the black sheep in the family because she is an artist whereas everyone else is an economist.
A single black sheep in a flock was considered to be good luck by shepherds, particularly throughout Derbyshire, Kent, Somerset, and Sussex. But in 1822, someone coined the idiom “black sheep” to denote that a member of a group was unlike others and of less worth, supposedly because a black sheep’s wool was sometimes of lower value because it could not be dyed.