Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: The moment you bring her to meet your best friend and you're nervous af! 😬😆  #thefriendtest
This tweet contains emotions: 
fear, pessimism