I have the same dream every single night. what does it mean?

Every night right befoe i go to sleep i get this really wierd feeling and i dont know i just thought maybe that would explain.. ok so my dream is like its really dark out side about like 5 or 6 in the morning right at the exact moment the sun starts to come up and its SO foggy you cant even see where your going and im barefoot and runing i dont know what forr but im running and then i stop and see and black figure standing in the fog (its so foggy i cant see it) and itts getting closer and closer and this whole time i cant move and right before i get to see who it is i wake up....always i have never seen it and its probably been about since i was like 7 or 8 and im 14 now i really am scared of this figure and the other day i thought i saw a black figure in my hallway whenever i tell my grandma she just calls me crazy...any idea why this would be happening?? please help..