I doubt all the time. each post. each comment. but it's because you are sharing a PART of yourself......... 'creatives' leave ourselves open when we post anything as it's a part of who we are.
The 'trick' is there is no trick...... just close your eyes and hit post........if you write from your heart and share your photo's no matter what YOU think.........I usually find the posts I am most unsure of are the ones people love the best..........
it's Steemit...... the worst thing that can happen here by sharing is someone writes you a DM and asks if you were drinking the night before :D
the best thing is............ well you don't know if you don't post it now do you?
hugs