Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: I'm also upset at my incorrect use of a comma. #grammar #struggle #hesitation #backtoschool 🎒📚
This tweet contains emotions: 
anger, disgust, pessimism, sadness