Do you believe in ghosts?

I used to never think ghosts were real, but lately I’ve been thinking my house is haunted. When I’m home alone where’s things always happen. The dogs bark at thin air like someone is standing there. Two nights ago I was trying to sleep and I felt a hand brush across my face. I’ve heard doors slamming around the house and I heard footsteps in the room above mine. Today I was sitting in my bed on instagram and a rap song I have never heard started playing really loud in my wall. The only device I have is in my hand and it isn’t the neighbors. One time my sister and her friend were getting coffee and when they went to get in the car, they both saw a girl leaning against it. My mom was in it and was confused why they weren’t approaching the car. They said she looked like a real person and then she disappeared. Her friend didn’t mention it at first cause she thought it was just her, but when my sister mentioned it then her friend did. What is your opinion on ghosts?