Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Focus on yourself. Don't let other's love define you when you're happy and don't let it make you bitter if you get hurt.
This tweet contains emotions: 
love, optimism, sadness