In order to be happy, I believe you must have a complete life balance. You could look at it as a happiness index. I break it down as such:

Health - 25%
Finances - 25%
Social - 25%
Career - 25%

Health - If you are not healthy, things are bad. Self explanatory.

Finances - I separate this from job/career section because you could have a real shitty job, but still be financially secure. On the flip side, you could have a really excellent job that you love and be far from financially secure.

Social - This is the friends and family section. Do you have friends? Do they like you? Do you spend time with them? How's your mom and them? Everything cool?

Career - Do you like what you do, are you content with your current employment scenario?

Using these metrics, you can calculate your own happiness index:

Is your leg broken? Maybe you assign health a 20% instead of the full 25%. Do you have stage 4 terminal lip fungus? Well, then maybe go with a 5% instead of 25%.

Are you flat broke? Do you live paycheck to paycheck? If so, congratulations, assign yourself 10% in the finance category, or maybe 20% if you just don't care. Only you can honestly assign your own percentage.

Did you accidentally run over your grandpa with a lawnmower? Guess what? you should go with a 5%, because you suck. Perhaps your family is all well and good, and on top of that you got a free blow job from your friend's sister, maybe you could go with the full 25. Good for you.

Do you want to take a huge steaming shit on your boss's desk, or maybe something even more sinister? Personally, I say do it, but afterwards you will probably need to assign yourself around a 15% in the career metric.

So, in summary, say you are a dude who has stage 4 terminal lip fungus, you are flat broke, and you hate your job, but you still got the BJ from your friend's sister, you would roughly score a 55%. You are not all that happy. Although, due to the beej from your friend's sister, you may think you are doing better than you really are, so please, be realistic.

Now, you are instructed to not only calculate your own happiness index according to the metrics, but when someone asks you how it's going casually in passing, give them your percentage and watch the look on the face, its priceless. And, should they make the horrible mistake of asking you what it means, waste a good half hour of their precious time that they could be using to get some hot mouth love from your friend's sister.