Determining if you hair is wavy is not always as cut and dry as you think. There are lots of people on the Facebook Wavy Hair Community didn't figure out that they had wavy hair until they were older. I'm one of them. I thought I had naturally fuzzy hair. Some people think their hair is naturally scraggly or naturally poofy. Others thought they had "stupidly straight" hair. They were sure their hair was straight, it just didn't dry straight when it air dried (a.k.a. wavy).
Wavy hair often needs a
good gel and some styling help (scrunching, diffusing, etc.) to reveal
it's true form. In the picture above left, I combed my hair with a wide
tooth comb when wet and air dried. I finger combed a few times as it
was drying. As you can see, there is almost no wave when styled that
way. The picture to the right shows my hair when scrunched and
partially dried with a diffuser and no touching as it finished air
drying (no curling iron). The pictures were taken within a month of
each other. As you can see, wavy hair can hide itself from its owner
unless you know to look for it. (My expression in the picture on the left says "I hope my face is actually in the frame and I'm not blinking this time.")
So how do you know if
you have wavy hair? Was your hair curly when you were a baby or
toddler? If yes, then it is probably wavy now. Here is another easy
way to find out. The next time you take a shower, wash and condition.
Comb your hair using a wide tooth comb with the conditioner in and then
rinse. Add a pea size of conditioner to wet hair when you are still in
the shower. Scrunch you hair with your hands and look in the mirror.
If your hair looks wavy and has bends, it is wavy. If the bends fall out
and don't want to stay, your hair is straight.
Here is another blog post on this subject.