BE HAPPY

Being negative disturbs your interaction with your environment, affecting your ability to perceive, remember, and reinforce existing or create new neural connections, while being happy improves your ability to be more cognitively alert and productive. Other than being much more fun to be around, being happy:

• stimulates the growth of nerve connections.
• improves cognition by increasing mental productivity.
• improves your ability to analyze and think.
• affects your view of surroundings.
• increases attentiveness.
• leads to more happy thoughts.

Happy people are more creative, solve problems faster, and tend to be more mentally alert. 

Your thoughts form your character, how you operate in the world, how far you travel mentally, physically, and spiritually. You are what you think you are, and all of your actions proceed from thought. Your inner thoughts will always be reflected in your outer circumstances, because self-generated changes in your life are always preceded by changes in the way you think about something.

As far as your brain, every thought releases brain chemicals. Being focused on negative thoughts effectively saps the brain of its positive forcefulness, slows it down, and can go as far as dimming your brain's ability to function, even creating depression. On the flip side, thinking positive, happy, hopeful, optimistic, joyful thoughts decreases cortisol and produces serotonin, which creates a sense of well-being. This helps your brain function at peak capacity.  Optimistic people tend to have better moods, to be more persevering and successful, and to experience better physical health. 
In addition, optimists:

• Lead happy, rich, fulfilled lives
• Spend the least amount of time alone, and the most time socializing
• Have good relationships
• Have better health habits
• Have stronger immune systems
• Live longer than pessimists

What does all this mean? It means that what we think, do, and say matters; that it affects who we become on the outside, the inside, and in our brain. Mostly, it means that you can retrain your brain to be more positive.  (Susan Reynolds Prime Your Gray Cells)

You have the ability to be anything and everything that you ever wanted to be.  Choose wisely.  
Remember that it takes less muscles to smile than to frown and that one smile will make all the difference in the life of someone else.  That someone could be you.  So slap on that beautiful smile and don't worry-be happy!