Our twenties are about watching our dreams go up in flames and learning from the ashes. Sometimes failure is the only way to learn, and what if the worst case is just moving back with our parents?
During a significant portion of our twenties, we can assume that many of our choices will not work out, and the companies we join or start will likely fail. Early adulthood is about watching our dreams go up in flames and learning as much as possible from the ashes.
Once we step out of school, there's no book or test. If we fail, we learn. In most cases, it's actually the only way to learn, especially if we're creating something new that the world has never seen before.
How to overcome the fear of failure? Remember that when we're early in our career, the worst that can happen if we take significant risks is probably just moving back with our parents and seeking support there.