I think I have a fear of natural disasters. How do I know?

Fears. Most people have some degree of fear of natural disasters. It has to do with survival.
Most people do! Most people fear natural disaster. If the fear is getting in the way of your normal function or overwhelming your everyday thinking, you should probably talk to someone.
Anxiety screen. Online test for free will tell you if you are more fearful than average.
Abnormal fear. interferes with daily function, sleep, work and relationships. It preoccupies your mind and doesn't allow you to enjoy life. It is normal to have respect for natural disasters and take precautions when there is a risk, Ie, wear life preserver in boats or deep water, go to storm shelter or evacuate when advised by authorities. If anxiety is a problem, counseling and possibly meds are helpful.