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