It's great that you finally realized that you don't need to please other people. Many people are trying to please others. You need to realize that most people don't look that closely at your pieces of art. Only you know the "mistakes" and unless you point them out others won't notice.
We should not be intimitated by pictures possted on this website. They should be viewed as inspiration and things we can practice to grow ourselves. We can learn from others not be intimitated.
I learned this by experience, but as far as quilts are concerned, at one of our quilt guild meetins we had a speaker who passed around quilts. When I looked at them I realized that she was actually no better then me as far as her quilting was concerned. (she was being published in a major magazine). She had an attitued that I loved. She said "Just quilt" don't worry if it isn't perfect! If you wait for perfection, you many never do anything. Let others enjoy your works of art.