Your unique part in life is to live and exist in an ever-changing world and do the best you can to sway with it just as the branch sways to the breeze. The more you resist change, the more fatigued and fragile you get.
The best way to be happy is to realize that eventually everything changes and it is the only thing in life you can count on. Embrace it as a part of the life you are in… here and now. It is an ever-changing world and changes mean new beginnings.