The Shadows Move

This is my first posting. My name is Louis, I am 19 and I live in England, in the south east of London, I won't specify too much.

I live in a new house, well we bought it when it was just land and watched it being built week by week, so I don't think there is nothing to associate with people dieing in the house, or in the area.

Some nights I would be just sitting in my living room, watching television, as most people my age do... I would see something move quickly in the corner of my eye, too large to be cat, and far too distinguished in shape to be the television casting shadows.

I see this often when down stairs alone, As if it waits for me to be vulnerable, they are always in the shape of what I would imagine a man in a cape and hood would look like but I only she his/hers/Its shadow, if you understand.

But it doesn't move like a human would, it glides, it looks like the shadow is traveling on 90 degree angle, leaning forward. Like on a cartoon when they would start running, Like Shaggy, from Scooby Doo for example.

I also get the chills and become cold, some nights I have heard breathing, that sounds like a man who has just ran a mile but trying not to sound tired, trying to sound silent but failing.

After seeing and hearing this I always retire to bed, sprinting up the stairs for dear live, I always have the feeling I'm being followed or watched when I climb my stairs. I don't know why, but I only feel it in my house.

When I get into bed I feel slightly more comfortable, at ease than anything, I do not know why, it like your bed is your sanctuary, nothing can harm you.

Thanks for reading; could anyone tell me what it might be?