I still check under my bed for monsters
Why would you still do that?
I heard some bad noises coming from under there.
If you're still checking for monsters as an adult people might think you are being silly. You should know there are no such thing as monsters.
But if I never check then how will I know if they're real or not?
Childhood innocence is nice to keep, but I believe sometimes it's good to grow up a little or it's a little silly. Don't you think it would be more productive to check for burglars or stray animals that wandered in? How about installing door cameras, or some in your room for some peace of mind?