Being beside oneself is often used to describe feeling overwhelmed or having strong emotions such as anger or frustration. Antonyms for this phrase could include feeling calm, relaxed, or composed. Alternatively, one might feel indifferent, apathetic, or disinterested. These contrasting feelings can be achieved through different methods, such as mindfulness techniques, stress-reducing activities, or simply taking a break from the source of the overwhelming emotions. By recognizing the various antonyms for being beside oneself, individuals can better understand and manage their emotional states, leading to increased well-being and mental health.