If you have every been disappointed with your photography you are not alone. Even the greatest photographers often miss capturing a scene. I have had streaks where every time I click the shutter button I have a gem. I have also gone for weeks and weeks shooting the most flat dull images.
When get so frustrated with the garbage coming out of my camera I want to give the whole thing up, I force my self to stop and remember why I do this in the first place. Photographing nature is one of my favorite things.
Being able to capture the emotion of a setting and share that with others is what really grounds me. When I am stressed about producing bad photography it most of the time is because I am trying too hard to take a picture that will sell.
I do this because I love it. If some day it pays the bills then I could truly make a living doing what I love, not many people can say that.