A couple of things that might help, although this fear is probably deeply ingrained:

“Why should I fear death? If I am, then death is not. If Death is, then I am not. Why should I fear that which can only exist when I do not? Long time men lay oppressed with slavish fear. Religious tyranny did domineer. At length the mighty one of Greece Began to assent the liberty of man.”

• Epicurus

If there’s a God and they created such suffering, they would not be a God.

“God," says Epicurus, "either wants to remove evils, but cannot; or he can, but does not want to; or he does not want to and cannot; or he wants to and can. If he wants to, but cannot, he is impotent; which is inadmissible in God. If he can, but does not want to, he is envious; which is also alien to God. If he does not want to and cannot, then he is envious and impotent; and this too cannot be attributed to God. If he wants to and can, which alone is proper to God, then where do evils come from? Or why does he not remove them? — Lactantius, On the Wrath of God