Are you a girl? This kind of thing often happens to girls! Ha ha! This is not something you are afraid of, such as shadows or big objects. Did you have this idea this morning? Why am I afraid of that shadow? Finally, I feel very strange. I'm not afraid of seeing big shadows during the day. Do you feel more curious? Hehe, you may have two possibilities. The first possibility is that you have night phobia-(little girls, boys like that also have it. The second is that you have been watching ghost movies recently, and you can't forget the third point, which you just learned at Baidu. This is called dark phobia, that is, you are afraid of black things, shadows and the night. Anyway, what you can see and can't touch is afraid of that.
Overcoming phobia is like overcoming acrophobia. You must practice slowly and regularly.
I hope it will help you. If you have any questions, please leave a message in my space. Thank you.