Why do the nightmares I had when I was a child still remind me and scare me many years later?

When I was a child, I lacked understanding and judgment on many things, such as being afraid of ghosts (thinking there are ghosts in the world), strangers (adult education) and monsters (thinking there are monsters). . . . . ; I don't grow up, I don't have the strength to protect myself, I don't feel safe, I'm afraid my parents will disappear, I'm afraid of losing my loved ones, and so on. . . . .

Some childhood fears can be impressive.

I wonder if this is the case.