Wake up and set aside an hour for personal development activities (meditation, self-introspection, observing nature, etc.) Do the things that make you feel blissful, optimistic and empowered so that you can set a positive tone for your day. I guarantee that once you start doing this, your days will be more enjoyable and fulfilling. Today is going to be the best day of your life. Duh!!
Think positive thoughts
When you find yourself thinking a negative thought, stop it immediately by any means necessary. Slap yourself in the face, yell something positive at the top of your lungs or jump up and down. Do whatever it takes to get back to a positive mindset as such is essential for continual happiness and success.