Most people believe the mind to be a mirror, more or less accurately reflecting the world outside them, not realizing on the contrary that the mind is itself the principal element of creation.
If you have fear of some pain or suffering, you should examine whether there is anything you can do about it. If you can, there is no need to worry about it; if you cannot do anything, then there is also no need to worry.
It is man's social nature which distinguishes him from the brute creation. If it is his privilege to be independent, it is equally his duty to be inter-dependent. Only an arrogant man will claim to be independent of everybody else and be self-contained.