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: @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