you'll be fine. you have to be in a pretty low place in your life usually for an entity to bother you. they attack when a person is at their weakest. the only advice i can give you is to think positive always. its when you give up on life is when they come to you. The only way you'll know is if you begin to question yourself and your mind because thats where they start. also they will go after your family relationships so stay close to your family. After a while you will know, there will be a sense of the worst loneliness and darkness you have ever felt. and also if you suspect you may have one refrain from using alcohol or drugs, trust me its the worst thing you could do its when you get the closest to your demon. but its a worst case scenerio kind of thing. and even if it does happen there are people that can help. i dont care if someone doesnt believe in them, most people wont until it happens to them. i was one of those skeptics until recently