Sometimes you win sometimes you learn just move ahead when you are in doubt
What do yo do when you really want to do something that you have never done before in your life ? You very well know that what you are going to do is good for you but still the liar in your brains stops you from doing it. It creates doubts in your mind and you just keep sitting there doing nothing.
What I would advice is to just go ahead and do it, after of course calculating the risks and weighing the pros and the cons. Because finally when you would have done two things will definitely, one of which would be that you will win. But, even if you don’t win, you are sure to learn something that might help you make future decisions in your life.