I'm the Mayor of my own Crazy Town. Sheriff, too.
The good thing about your neighbors thinking you're a crazy person is that it really frees you up from here on out. You don't have to try and behave a certain way to keep them from finding out.
I talk to my cat. But I don't meow at her. No, that would be ridiculous. I talk to her in English words, which she clearly understands.
Meow meow meow. Meow meow meeeeeeeeeeow!
"Oh, thank god you woke me, I was almost late for my appointment to destroy something expensive in your home! You're the best, strangely bipedal monster cat, now feed me." ~Translation of your car's thoughts.
I carry on conversations. Screw the neighbors.
That's not crazy. Crazy is my husband and I meowing at each other for no reason and WE DON'T EVEN HAVE A CAT.