Creative Boundaries: A Way to Decide What to Make or Write Next

(See what I did with this frame here?)
I'm not sure how to begin this post, but that's my problem. I struggle with being indecisive about what to start and how to start it. I think there are two reasons people might get into this state: either being too picky or too open-minded. 
If you're too picky, you don't like any idea, or maybe you've internalized a feeling of judgment from other people, so you can shoot down any idea based on the certainty that it will be despised by the entire worl...