Determine the emotional tone of the following tweet: "I'm way too busy and tired all the time to worry about my past and the things I should be regretting (but I never am).". Use the provided emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. Respond with the emotions you identify or "neutral or no emotion".
anticipation, joy, optimism, sadness