The mind is everything; what you think, you become. ~Socrates
You really are the sum total of your thoughts.
Whether you know it or not your personality is a reflection of what is happening between your ears. If you are not satisfied in life, you cannot hide it for long. Happiness starts on the inside and works its way outward from there. When you are not happy it, too, starts on the inside.
I have said many times that happiness is a state of mind, not a state of being. It seems that the average person spends most of his or her time complaining. In fact, I would venture a guess that most people have minds cluttered with negative thoughts.
If you start the work week dreading Mondays, you are starting on the wrong foot. Why not wake up to the idea that it's Monday, the start of a new week and new opportunities. Why not say to yourself that it's a great day. Then, make a list of about twenty things for which you are grateful. If you lose enthusiasm at any point of your day, read the list and picture yourself enjoying those blessings.
If you are not happy in your relationships, write down the things you really love about your spouse and read it every morning and every evening. Then, be grateful for those blessings.
Life is what you make of it and that typically depends on whether or not you pursue your dreams. If you are not satisfied, do you wonder why? Make a list of the things you really want in life. Make those your goals.
Take that list of things for which you are grateful and read them first thing in the morning and again at night-- just before going to bed. Doing this, you are improving your mindset by auto-suggestion. Focusing on your blessings is one of the easiest ways of changing how you see the world.
When you feel grateful for the things you have in life, accomplishing your goals is much easier.