How do I handle feeling terrified by how much I don't know in cybersecurity?

You just started, and the size of what you do not know feels like standing at the edge of something endless. That terror is honest. Security is vast, and no one hands you the whole map. What you are feeling is the true scale of the field, seen clearly for the first time. Here is the relief: no one knows all of it. Not the veterans, not the experts you follow. Everyone specializes, and everyone has huge blank spots they quietly work around. The goal was never to know everything. It is to know your corner well and know how to find the rest. Pick one area and go deep enough to feel solid somewhere. Standing firm in one place makes the vastness feel less like a threat and more like a map you are slowly filling in. You do not have to conquer the field. You just have to start with one square of it.