So what is happines? Don't you think laughing or smiling is happines. No it's not happines is the state of human being to release unlimited amount of positive energy. Do you know that everyone has that ability don't you? This mental state of a person can be only achieved by destroying all the negative energy and being tension free. Talking about tension it comes from our daily life problems and if we are not capable of facing that problem we will start release negative energy. This release of negative energy cause many other problems. So we must learn how to face our daily life problems and not to make other problems worst. If you are in any trouble just think how to face it if you are not getting any answers just think again and again and again until you get an answer to solve it. This is how a person can solve a problem and if you are capable of solving a problem you are capable of being happy in your entire life so be happy and I recommend you to practice yoga makes your mind free and try to practice meditation.
https://en.m.wikipedia.org/wiki/Happiness