Haha! Well it’s not exactly supposed to scare you, it’s actually evidence for why YOU are the computer! It’s an image on your “desktop”
You are the computer itself. Nothing around you is real, it’s all a digital manifestation of the data in the computer. That’s what the ending tells you. You’re sitting at a “desktop” with games, and pictures on it, and there’s a trash bin nearby. You are the main character (hence why it calls you by your name).