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: On the wheel as we grow older and become aware of ourselves as individuals with a dull responsibility in life?
This tweet contains emotions: 
disgust, optimism, pessimism, sadness