comfortable in one's own skin

Adjective

 * 1)  Relaxed and confident in one's manner of presenting oneself and interacting with others; conveying the impression that one has a clear, satisfying understanding of one's own abilities and situation.

Translations

 * Dutch: goed in zijn vel
 * Finnish: viihtyä omana itsenään
 * French:, , bien dans ses pompes, bien dans ses bottes
 * Polish: czuć się dobrze w swojej skórze