Bottom line - its a choice. Just like love. Sometimes you have to choose to love someone even when they are giving you every reason to just stop loving them. Happiness is some what the same. You have to choose to be happy even when everything in your life tells you not to be. It's a choice. And it's your choice.
Therefore, if you're an unhappy person, 99% of you being miserable is because you choose to remain that way. Sometimes, you have to narrow it down, maybe even dumb it down, for yourself. Find happiness in the little things because if you only set your sights on the big things you're only going to be let down. Going through life happily is much easier than being miserable all the time.
Life is short, so love the ones you're with, enjoy the things you have, and never stop being thankful for where you are because it could be MUCH worse. I know that's a hokey and overused, but it's a true statement. Sure, I've had moments in my life where it's been really hard, times where I didn't think it could get much worse, and yes, I have reached points where I've thought about prematurely ending my life. But the second I got to that point I thought to myself - what's the point of doing that? Why end this life that's a gift from God just because I'm having a tough couple of days/months? Perspective.
So, take it from one who has tried to live this life as though everything is always going to be easy, happy, love-filled, and a dream come true. It's not always like that. There are going to be hard times but what makes the difference is what you do in the midst of those hard times. Because there are still beautiful things in this world that seems greatly filled with darkness and sin. There are still things that have yet to be seen, experienced, witnessed - things that go far beyond any expectation.
"The morning finds me here at heaven's door
A place I've been so many times before
Familiar thoughts and phrases start to flow
And carry me to places that I know so well
But dare I go where I don't understand
And do I dare remember where I am
I stand before the great eternal throne
The one that God Himself is seated on
And I, I've been invited as a son
Oh I, I've been invited to come and ..
Believe the unbelievable
Receive the inconceivable
And see beyond my wildest imagination
Lord, I come with great expectations"
Never be afraid, or too stiff-necked, to realize your need for help. Your need for help. For rescue. God is with you always, and is always working in you, and around you. He is the best foundation to build upon - the strength that comes from God is unlike any other and it cannot be obtained from worldly things. It comes from Him, but only when we surrender ourselves to Him.
And don't take life so seriously that you forget to laugh or smile. :) Surround yourself with good people and enjoy the life you've been given! You never know how contagious your happiness can be - because happiness throws a shower of sparks, someone is bound to be touched by it.