What Do I Do? I Think My House Is Haunted

I really need your help and please comment below if you have any knowledge on what might be going on. I'll skip right to it then.

It was midday and I was home alone, this is when the first weird thing happened. I went for a pee before heading out to catch a movie with some friends when the mirror behind me began shaking from side to side. No windows were open, and I had certainly not touched it. It was as if someone had poked it and the mirror moved.

One night while playing video games, my little bro was hyper and sprinting from one side of the room to the other. I shouted at him to stop as he was annoying, and he did. We argued for at least 5 seconds. He was stood still and I was sitting opposite him, on my bed. Behind my bro, there's a wardrobe with a sheet over it. It flung open of its own accord. Leaving me and my brother stunned. The next morning I told my mother about it, and she asked if it was a gush of wind when my brother stopped sprinting. I knew this would be impossible as we were arguing for about five seconds, if there was any wind, it would have moved the curtain/sheet instantly. Also, it looked as if somebody lifted it up and dropped it.

Another night while playing video games (Again!) I was heading down stairs when I saw my hair was a mess in the mirror in front of me. I began patting it down when a black shadow moved behind me. I was cold down the back part of my whole body, but the front was fine. I was creeped out.

Lastly and more recently, I was on the toilet when I heard footsteps right next to me. I have laminate flooring in my bathroom and it was as if someone was walking barefoot across it, about two feet away from me.

The weirdest thing upon all of this is that I don't feel uncomfortable in my house and don't have a feeling of anyone else in my presence. I'm confused, and I believe the "hauntings" will continue.

Please comment on what the heck is going on. I need answers quickly!