Here's something to think about.

Are you ever truly happy? You may experience defined moments of happiness, but it isn't lasting. Even during the phases of life when you're relatively happy - which means you're less sad than usual - you are sitting on edge, constantly questioning, waiting, with horrific anticipation, for the next thing to go drastically wrong. Even if something isn't about to go wrong, your overactive imagination will tell you that there is something drastically wrong. Moments of happiness don't come often. In fact, sadness comes disguised as a moment of happiness.

Want an example?
Say you meet an old, dear friend after a very long time. That moment when you meet, is your happiest moment. As you sit and talk, you reminisce in the good times you had had. Then, you start to grow sad that things aren't the same, you wish that you could rewind time. Nostalgia they call it. It lasts for the rest of your conversation. Then, its time to leave - you're sad to be leaving. Once you're alone with your thoughts, you think of how great it had been with this friend, how times have changed, how things aren't as great as they used to be.

You draw instances from your past, some you're not proud of, some you don't regret. And then you remember the dream you had at that point in life. And you realise you haven't reached your goal, you are growing old, and your dreams seem so far away, so far out of reach. And you listen to a song that increases the nostalgia. And you think, how you might've let down the people in your life who're important to you. How you've not done enough sometimes. How you hadn't done enough, how you did too much. How you gave yourself away, without really caring about what you were doing. Then, next time, not being able to give that easily because you gave too much before, and you're once bitten, twice shy. You realise that you want to be a good person, something you would've been proud of, had you still been a child. And you realise that at some level, perhaps, you have let yourself down. And that becomes the hardest thing to live with. You are still afraid, of what the future holds in store, whether the people you care so much about will stay in your life or drift away, and you will perhaps continue to hope that things will get better, easier. Continue, to learn that your hope is in vain. Continue, like you can't run from it, to set yourself to certain things, and disappoint yourself. Continue, to dwell in the bane of life. Continue, to hope for no change, but make amends, because change is inevitable. Wait, for life to lash at you again, and hold out your skin, toughened and hardened by past blows, to take yet another.

Fall, pick yourself to fall yet again. Such is the constance of life, much like waves of the sea - up, down, up, down, up, down, only stopping in a final crash of death.