One great fear to over come is the fear of failure, one failure is only one try so you should not give up on what you are trying to do or accomplish. You must also have belief in yourself and you mental abilities and should you have taken to develop your BIMI (Brain, Intellect, Mind, Intelligence), along with Faith ( always good) There is nothing to hold you back except you.
You should take time to get to know your fears one at a time, get to know these fears and you may find that many of your fears are nothing but hot air. Failure of an idea in one respect does not mean that the idea is a failure in another respect. So push on and what you thought was a mountain in your way was only a mole hill.