I have people tell me to smile all the time, I get caught pretty often in thought and tend to maintain a serious look most times.
My response is typically "I know" "I'm working on it" then I smile and go on with my day.
All this talk about how life sucks and happiness is pointless blah blah blah is ridiculous.
There are far worse off people, that still manage to find things to smile about.
If I got down and out about my life's crappy points I'd be better off just ending it all.
Happiness does not just happen, you have to put fourth effort to maintain it. You will always get out what you put in.
The problem is that most people don't realize that the bad stuff is the easy stuff, you don't have to do anything at all to get the bad stuff it takes zero effort. I promise try it, sit around and do nothing and be miserable, the bad will give you all it's got over and over.
Which is exactly why the worst thing you can do when dealt a crappy hand is to let it even slow you down a little. These are the times that working harder for happiness is most important. Putting on a smile matched with a positive attitude is one of the strongest foundations to true happiness anyone can have.
I hope that made sense.