Life is the way it is,(eg. bad, good, sucky) is it because of the things we did? or the things we didn't do?

It's because of both. What's more important though is the lessons we learn from the past & the wisdom we draw from it. Those of us who suffer from things we did in our past must choose to make life the best it can be from this point on and not make the same mistake again. We would also be wise to recognize opportunities that came our way that we didn't acknowledge or act upon until it was too late and not let those opportunities p us by in the future. That said, happiness is a choice. Regardless of what cirstances you find yourself in at this very moment you can choose to be happy or you can choose to be miserable. Once you realize that is within your own power and not dependant upon some material thing or some other person you're well on your way to a happy life.