the odd one out

(also the odd man out)

Definition

a person or thing that is different from or kept apart from others that form a group or set

Guess which number of the following sequence is the odd one out.

She was always the odd one out at school - she didn't have many friends.

(Definition of the odd one out from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

worried or nervous about something that is going to happen

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