Do our fears manifest reality?

If we are afraid of something happening do you think that brings the energy stronger so the event will happen in order for us to learn how to overcome it?
So basically what I am asking is do our fears manifest reality? The course is teaching us that life is an illusion that we create. If this is true then nothing bad can really happened if we are not fearing it. But then how does that explain tragic events? 
Please feel free to answer honestly. 

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