Keep (oneself) to (oneself) American British verb phrase
To isolate oneself from others, to be unfriendly or sociable
Jenny was a timid girl, so she always curls in the corner of class to keep herself to herself.
After undergoing emotional shock, she keeps herself to herself.
I like keeping myself to myself amidst the tranquility of natural landscapes.
The verb "keep" should be conjugated according to its tense.
A problem or difficult circumstance
I'm short-sighted, so forgetting my glasses is a real hair in the butter for my sight.