something's been off lately

it's like, you know when you leave the house and are halfway down the street and are all "did I lock my front door?"
it's like that. I didn't lock the front door in my mind and now it's nagging at me.
maybe someone's in there. maybe someone isn't.
are they going to break my stuff? steal it?
maybe just rearrange it so when I come home I don't know where anything is anymore.
so now I'm scared to walk around in the dark because I might bump myself on something sharp that didn't used to be there.
I was never scared of the dark before.