There is a fine line between bravery and stupidity. And doing stunts without any expert supervision is very very stupid. I am, by no means advocating to take those kinds of risks. What i was trying to convey is taking risks that have a chance of making your life better i.e. taking creative risks like writing a book or creating music. But most of the time we are scared that people may not think we are good enough and we don't go through with whatever it is that we were planning to do.
That is what I was trying to imply. I guess I should have been more elaborate in the post.