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: I believe the work I do is meaningful; my clients would agree but at the end of the day, I feel like a pawn, lost in this chaotic world.
This tweet contains emotions: 
pessimism, sadness