When I start thinking like that it usually means I'm way too bored or tired and need to just sleep. Don't get mad at yourself, you're just depressed. I deal with that too, kind of thinking like the whole world revolves around me but it's because I feel like everything is unreal, like I'm unreal so I try to make up paranoid conclusions to WHY. I can't even feel my body most of the time so i think everything is fake or that I'm a ghost and I'm dead. I have to have contact with other people a lot to ground myself and be reminded that I'm not dead or invisible and they aren't fake, at least they aren't suppose to be fake and I just think of it like that. Talking to other people really helps even when you're feeling really out of it. staying busy and productive can really help too.. maybe do some yard work, do more house chores, get a job or help a neighbor? You don't sound dumb or insane. I hope you feel better soon.