be oneself
To be in one's most natural, comfortable, sincere, and ingenuous state of mind and being. You should always try to be yourself with those you care about. I told her to just be herself during the interview. I had a really hard time being myself when I was younger, but with age comes self-acceptance, it seems.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.