The goal is to learn to work the point. As you can see there are many more shots hit to set up winning shots than there are actual winning shots. Playing intelligent doubles means knowing your capabilities working hard to play within those capabilities. The reality is that the majority of points, even in doubles, are lost on errors and not won on winners. I would like to see you hit gradually more offensive shots, stretch your opponent, make them cover the whole court and then end the point with an average volley rather than a spectactular groundstroke.
True confidence comes with the ability to string patterns of shots together.
It really is easier to hit three good shots than one great one. You should feel that the longer the point goes on the greater your odds of winning it.