4. I stopped putting my happiness in the hands of others.
I used to find reasons for why I was sad or unhappy or unfulfilled or unsatisfied by placing my happiness in the hands of others, giving people a certain kind of responsibility to make me happy. And yes, it's great to be in a committed relationship or expect certain things like that from your good friends, but at the end of the day -- no one is responsible for your happiness but YOU. If you constantly depend on other people to make yourself happy, you are constantly going to be disappointed.
And it's important to remember that you very well do possess the power to make yourself happy. You don't have to depend on others for your own happiness. And when you start to do things for yourself -- become independent in this pursuit of happiness -- no one will be able to take that happiness from you.