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: @MHChat if we don't understand how to express our emotions to others, may lead to sadness / loneliness &amp; neg impact on long term mh #MHChat
This tweet contains emotions: 
pessimism, sadness