Many set themselves up for failure by thinking they should be happy constantly. When it doesn't turn out that way, they wonder what is wrong with them and/or their lives that they aren't feeling happy.
Instead, they should realize that happiness is an emotion - as are sadness, anger, surprise and excitement. If one realizes that all emotions ebb & flow, and let go of the theory that unless they are feeling happy the majority of time they are not "normal", many will soon figure out that life is easier to manage on a day-to-day basis.
Why not focus on feeling contentment instead? Ask yourself, "Am I content right now?" If the answer is anything besides yes, try to figure out what you can do to help get yourself closer to the goal of contentment.
Having said that, one must also remember that it is prefectly "normal" to feel sad, blue, anxious or other "negative" emotions from time-to-time. Do not discount these emotions. Often, when we deny or bury emotions, they will linger under the surface and find other, unhealthy ways of emerging. When you find yourself feeling sad, for example, allot a set amount of time to immerse yourself in the emotion and the causes for it; to think about why you might be feeling this way.
And then focus on letting go of that emotion, of not allowing it to consume you. If it's a situation you can do something about, try writing possible solutions or plans to change it, then act on it.
If it is something that you do not have control over, try telling yourself exactly that: "I do not have control over that. There is nothing at all I can do about it." and work on letting it go instead of allowing it to eat away at you.
Practice this as often as needed. Practice makes perfect.
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