oneself / first-person pronoun: I, me (often shows the speaker's lower position in a hierarchy than the addressee) / (Kansai) you

(Internet slang, derogatory) person such as upper class and the elite

myself, oneself

a photograph of oneself, a photographic self-portrait / (especially) a selfie

to take a photograph of oneself, to take a selfie

(idiomatic) selfishness, self-centeredness

one's own concern or problem

talking about oneself (especially, when the audience is not interested)

soul-searching

justification, rationale, warrant / self-justification, presenting one's own deeds or words as reasonable