What does my horror movie based dream mean?

It sounds to me like just a weird dream, don't worry about it, seriously. Your mind tends to wander when you sleep. So basically don't read too much into it :) I have odd dreams all the time, they don't mean anything, most of them are not metaphorical, You have several dreams a night but you only remember a few and you could have had a dream that shows the complete opposite just you didn't remember it