Pick one person you are wary of. It might be a colleague, a relative, a neighbour.
Write down what you believe about them. Then go through it line by line and ask: how much of this comes from observing them, and how much have I filled in myself? Then, over the next few weeks, watch what they actually do, more than once, before you decide.
Next time they do something that makes you uncomfortable, try to separate two things: what they actually did, and the meaning you have assigned to it. Am I responding to the person in front of me, or to the picture I have made of them?
You may find the person was never the source of the fear. The story was. And a story can be checked, in the present, one conversation at a time.