keep to yourself
US /kiːp tə jərˈself/
UK /kiːp tə jərˈself/

1.
manter-se reservado, ser discreto
to remain private and not share personal information or feelings with others
:
•
She tends to keep to herself and doesn't socialize much.
Ela tende a manter-se reservada e não socializa muito.
•
It's better to keep to yourself if you don't want to get involved in office gossip.
É melhor manter-se reservado se você não quiser se envolver em fofocas de escritório.