Be advised that your own words can steal the thunder of your idea more easily than the negativity of others. And you have to watch out for approval too. You can get all your satisfaction from the verbal approval of others and then there's no need to continue. It seems that words march along with all our dreamed creations and if they are let out to run amuck they can be instrumental in taking down the dream. Sharing an idea and even enthusing about it seems natural because of the respect we have for communication.
Verbal skills are one of mankind's greatest assets.
Also, in many fields the second opinion is valuable. The second opinion may even help you to see the folly of your idea and save you a lot of trouble. There's power behind the dam of silence. It's often best to try to live privately in the dreams of your imagination until you can hang out their realizations to the world. Don't even tell your dog or your cat.