It can’t be heat damage…. could it?

Don't forget I have a contest going on!

My hair at the base back of my head is really REALLY weird. It's straight. No curl at all. Not even a little bit. Furthermore, it is a kinky straight. When i say that, i mean that it doesn't hang limply. It kind of looks like it wants to curl, but it won't.

It is not a huge deal, because you rarely see it, but I have heard of women having "heat trained" hair. Which is just, heat damage in my opinion. So I am wondering if this is the case. I have not used a blow dryer, curling iron, etc, in well over a year. Any thoughts you may have on this, I would love to hear.