Deceived oneself is a phrase that is commonly used to describe a situation in which an individual has convinced themselves of something that is not true or meant to be. The antonyms for "deceived oneself" could include being honest with oneself, having clarity and awareness, and acknowledging the truth. Being truthful with oneself means being able to accept one's shortcomings and mistakes, and acknowledging that there are things that need improvement or change in one's life. Having clarity and a sense of awareness also involves being mindful of one's thoughts, emotions, and actions, and having a deeper understanding of oneself. In essence, the antonym for "deceived oneself" is to be truthful, honest, and self-aware.