In fact, there're happy people as much as unhappy people in this world :)

A person who is crying today will smile tomorrow.

Haha, nope. I've never studied English grammar, so I would feel like an absolute conman taking money for something I don't even know all that much about. 

I'll just offer my advice around here for free, for now. :D

Spangola,did not you decide to be tutor? 

.

There are both around me but I usually notice unhappy one. I think I have a fear to see them if seeing more.

I look at the people and see how the people relate to each other , I conclude , there are many unhappy people in the world.

If they were happy , they had to be kind , they had to see good things, they had to praise others.They had to make friends.