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: @excalibater I'm very shy irl and lately I feel like everyone's doing their own thing and I don't fit in anywhere and I feel lonely :(
This tweet contains emotions: 
fear, pessimism, sadness