Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Transitioning to a new job is hard when you have nothing but joyful memories of the previous one. Thanks @LifeTeen for changing my life! ❤️
This tweet contains emotions: 
joy, love, optimism