Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: I'm also upset at my incorrect use of a comma. #grammar #struggle #hesitation #backtoschool 🎒📚
This tweet contains emotions: 
anger, disgust, pessimism, sadness