keep oneself to oneself

v.

不交际；离群索居；

Catching objects thrown to oneself: Testing control strategies for object interception in a novel domain.
Cycling helps to keep oneself fit, curb pollution
The Advocacy of “Chant or Sing to Oneself” by the School of Mind in Southern Song Dynasty
Lying to Oneself
On Duties to Oneself
Self‐Legislation and Duties to Oneself
More About Duties to Oneself
On speaking to oneself.
Duties to Oneself
Duties to Oneself: A New Defense Sketched