Your creations should expand the experience of reality.
Science has given us the ability to manipulate the world around us, and in turn, expanded what is possible within human experience.
>Shitting on their shoe is art.
If your definition of art includes that, then I suppose so.
You should think about the effect of a specific piece of art instead of thinking about what is and what is not art, or what should be considered art.
>How do I find an artistic pursuit that lets me feel I've made the world better, rather than simply having vomited into an ever-expanding pool of distractions that serve no purpose?
Think about how you can create art that speaks of things beyond you. Think about how you can create art that transcends the here and now. Think about how you can create art that adds a spiritual dimension to an otherwise animal existence.