"Put on the whole armour of God, that ye may be able to stand against the wiles of the devil." (Ephesians 6:11)
The very real fears and struggles we sense--and face, respectively--are aimed at the upside or inverse of what we already possess. And of what we're called and created to do. Say your fear is simply being yourself. It's not that you're doing anything wrong (at least you don't feel it) but you're just sensitive. To what though? I can't tell you how many times I would feel off to my vacant periphery some eidolon impression meant to distract me. I'll look up from writing and typing and inevitably misspell a word. A diversion. Something to slow me down or interrupt my train of thought. Is this evil? Is it something of evil? Who did it? Coffeeshops I frequent patronize the same types of people all over the city. I'll look up as someone walks in and look down and have to reread the passage in order to re-rail my train of thought. All of this speaks, not to the presence of people who distract and any spiritual accompaniment, but of my strength of mind. How focused am I on God? Because His presence pervades to the very depth of being. No entity (human or otherwise) can touch you there. This is why Paul wrote what he did at the top. He continues:
"For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Wherefore take unto you the whole armour of God..." (Ephesians 6:12-13a)
Jesus effectively defeated Satan and his host. When Jesus died on the cross, the devil lost his keys. He lost what power he had over this world. But rather than keep this power for Himself, Jesus gives it to us.
"The heaven, even the heavens, are the Lord's: but the earth hath He given to the children of men." (Psalm 115:16)
The Lord is holding your place. And the fear you sense when you look out over the horizon--any horizon you feel called to traverse--is a shadow. The darkness is real but it doesn't hold a candle to the light on your insides. And with reference to my struggles with intangible feelings and perceptions and whatnot? Who knows. I do know that I'm supposed to be doing whatever it is I'm doing and so therefore all confusion and darkness and superstition will clear up. But if you ask me, something's out there. But God is greater.