Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: The moment you bring her to meet your best friend and you're nervous af! 😬😆  #thefriendtest
This tweet contains emotions: 
fear, pessimism