Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: Defining yourself in terms of opposition, i.e. the clouded mirror phenomena, is almost always a mistake.
This tweet contains emotions: 
anger, anticipation, disgust, pessimism