Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
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