I stopped answering the door after I heard my own voice outside

I’ve never told anyone this because it sounds impossible, but a few months ago I started hearing someone outside my apartment calling my name in my exact voice. At first I thought it was my imagination or maybe someone messing around in the hallway, but it kept happening late at night, always the same tone, the same way I say it when I am tired. The strange part was that it only happened when I was alone, and every time I got close to the door, it would stop completely, like it knew I was listening. One night I checked the peephole and saw nothing, but then my phone lit up with a voice recording I did not make. It was me whispering “open the door” over and over, even though I had been asleep. After that I started sleeping with the lights on, but the knocking still happens sometimes, and once I even heard my own voice laughing softly right outside my bedroom door. I moved the furniture in front of it, but I still do not feel alone in my apartment, and I have stopped answering doors completely, even when I know I am not the only one inside anymore.