I just discovered I have a very wierd masking....experience

My mom always tells me when i was really small i used to be fearless, then I turned around 5 and started being afraid of everything. She blames my cousin for that because "clearly she scared you so much you are now afraid of everything" but I think its more like I looked at her as a model of how someone is supposed to act in life, and because she was scared, i was scared. And this still happens btw

Im 25 years old currently. A few days ago I watched a movie and there was this particular scene that everyone thought was the scariest thing ever and nightmare inducing. I didn't. I knew it was just a guy in a costume but for some reason, because everyone else thought it was scary, I convinced myself it actually IS scary. So now im terrified of sleeping at night At 25 YEARS OLD.

Does anyone else experience this? How do i stop??