
Keep to yourself
Social Isolation
Used when someone prefers not to interact socially or be part of group activities.

Even at parties, Joe tends to keep to himself.
Lack of Interest
Implies a person might not be interested in socializing or doesn't seek friends.

Mia is always in the library and keeps to herself.
Observing
Can be used to describe someone who watches others without getting involved.

At the dance, he just kept to himself, observing from the sidelines.
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