ROFL. This is SO me. I honestly thought I had straight hair that just wasn't very...straight. A curly-haired friend finally explained it to me, and I was like "Oh, but my hair isn't actually wavy. It's just oddly unmanageable, frizzy and sticks up and forms horns sometimes. But it's straight, mind you."
I had the exact same cut as Cheetara for years. And I had to keep it super-short, because once it got to my eyebrows it started forming...hair horns, I used to call them. I was in total wave denial.
I actually used to PERM my hair, in my teens and twenties, if you can believe that. With hilarious results. When you take very fine but extremely thick wavy hair and CURL IT WITH TEENSY LITTLE ROLLERS, the only result you possibly can get is something akin to Ronald McDonald. Three times I did this...always thinking it would be different this time, for unfathomable reasons.