We actually need to question what fear is doing and why it is doing it, and where it's really coming from. It's all too easy to simply "be afraid", to experience the fear, without any kind of questioning of whether the fear is natural or needed or well founded.
Fear is the opposite of love. You can't be loving when you're afraid. Which would you rather be, loving or afraid? Which one is a more truth-filled experience?
It's one thing to become afraid and to think, well, I'm afraid "because of" a big long random list of outside influences that you think cause the fear. And to then be locked inside that perception with no apparent way out of it, since you believe that you are not the one who is choosing the fear at all.
But we can't do that. We have to bring fear into question, because fear is actually untruth. It is always a lie. There is never any good reason to be afraid. Fear is never justified. And fear is always a deceptive ego mechanism for making your situation worse.
We have to look at our "fearing" and take some responsibility for generating this condition. We have to be willing to admit that we are the ones who have actually created fear. We keep making it. We keep putting it in our experience. We keep choosing it. And we keep using it ON PURPOSE to play the part of victim so that we can get some side-benefits.
Fear allows us to disown responsibility. It allows us to seemingly shield ourselves from guilt. It lets us pretend that someone else is at fault. It allows us to label others as enemies and project guilt onto them. It lets us hide from God. It lets us have a separate identity that God did not create. And it allows us to pursue our 'dream' of being an individual. These are quite significant reasons for fear that we need to look at and own up to if we're to live a life without fear.
Is it possible to live with no fear? To be 100% fearless? Not like, some idiot that is over-confident and reckless and putting on a show of bravado while being secretly insecure... but the complete absence of all fear, and therefore, only the presence of unconditional love at all times? A love that is so certain and so secure that within it there can be no reason for fear? And no desire to choose it. Of course it is possible, as Jesus has demonstrated.
So don't think fear is just some natural biological or human thing. It's not. It's a state of mental illness. It is insanity. And it is a game that we keep playing with ourselves to pretend we're not who we are. There are some very sneaky reasons for having fear, and none of them are honest or truthful.
So when Jesus says "be not afraid", he isn't just saying, don't freak out when I appear out of nowhere, He's saying, stop choosing fear and recognize that love is the only reality. He's not telling us to be brave in the face of danger, he's telling us there IS no danger. And that any efforts we're making to go into fear without questioning it, are really a deception on our part. We don' need to be afraid because only love is real.