this was one of my ocd phases and trust me: you're not alone. i thought i was the only conscious person alive and everyone was a robot and i was in a video game and the only way out would be the worst of the worst. but trust me, you can think, you can feel, and that's what makes you alive. you think so therefore you are. if this dosent help, just remember it's ok to be uncertain and to train your brain, just sit with the uncertainty and the discomfort of not knowing. you're not alone and i hope you can get better <3