Macbook Pro keeps changing my settings so that Guest Users can log-in.

I have had Guest Users turned off since I got my Macbook. Nobody else is using this computer and it's annoying to have to click my name every time, instead of just typing in my password. I've searched online and only got tutorials on how to set up Users. I've turned off Guest settings, I've messed with a bunch of other settings that people have suggested trying, and it still happens every time I shut off my computer.