If fearless means having no fear then this is very dangerous. It means you ignore a perfectly good warning system which is meant to keep you alive. If fear prevents you from changing or trying new things, then it is a hindrance. You can examine your fear and then decide whether to act or not. There is another voice in there who can decide whether the activity is really dangerous or whether the system is overly sensitive. For example, take public speaking. Your first reaction may suggest that death is imminent when asked to speak to a group of people. The second voice will tell you that this is not a life threatening situation once you start breathing again. You may still decide not to accept the invitation but you won’t avoid it because you are frightened of dying. This may be a great opportunity once you realise that the fear is simply a warning and not a death threat. Warnings are good but don’t need to stop you from developing new skills or telling your story.