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: The moment you bring her to meet your best friend and you're nervous af! 😬😆  #thefriendtest
This tweet contains emotions: 
fear, pessimism