I thought so too, but I also remember a kid telling me in middle school that I had a bald spot and that was many years ago. I feel like I might have always been like this.
I got my hair cut really short last week after having it pretty long for most of my life. I noticed this spot in the back of my head where I can see my scalp more than in other areas. Everyone says it looks normal, even my doctor, but I'm still obsessed with it and I can't stop thinking about it...