Real risk is just that, something that can take your business down, or seriously impact your world and life.
Perceived risk is your emotions or others emotions coloring the facts and it makes you make decisions based not on fact but on what you think is a possibility.
You cannot predict the future, and many studies have shown that when we do, we are always wrong.
Many studies have also shown we let many things influence our decision making, and it is important as an entrepreneur to make your decisions based on what you know as fact and not on opinion.
Once you detail a situation, collect the facts, what you know to be true, what you can show to others. Know it, and once you know what is real, then you can plan how to overcome true risk, or correct it, or eliminate it.