There is nothing to get afraid or scared of,  you should just enjoy the horror movies. Yes, there are some movies like Anabelle, The Conjuring and much more which are claimed by their makers that they are based on real stories but still they are just movies which you should only enjoy it.

Getting scared after watching a horror movie is genuine it happens as the scary scenes keep revolving in our mind throughout a day. As you have asked what can I stop getting scared after watching a horror movie? I will suggest you keep yourself surrounded by people and try to make yourself busy in any sort of work.

By making yourself busy and by and surrounding yourself by people the scenes and the things which you are scared of don’t revolve in your mind and as the time passes will pass it will stop affecting you.