I have been natural some 2 and 1/2 years, on the hair boards for over a year, I still don't know for sure. /images/graemlins/blush.gif
It seems to be more a guesstimation than a science. Like another poster said, you don't know if your hairtype looks like something else because of scab hair, hair weight, an improper diet, breakage, or products. Maybe there is no locked-in hair type, and it simply changes as a result of all of these. Maybe it is a combination of all of these things.
It could be less what it was when it started growing out of your head, and more how it ended up after a while. You can see this effect in children. When their hair is short, you don't know what it will end up as, but at is gets longer, it takes on more of its true nature. When my sister was little, she looked like she had a soft 'fro, but when her hair hit her butt, it looked loosely curled.
At first I thought I was 3c, then it looked more mostly 4a (again, I think), and it looks 3c-ish around my hairline. Especially around my ears, the curl pattern looks considerably looser. I always have to scrunch up the looser curls to match the tighter ones. But then again, as it gets longer, it looks looser.
Pictures of curl types only help so much. It is hard to tell when you see a dark mass of curls, exactly what hair type it is, only that it may or may not be close to yours.
Maybe some day I will figure it out. Perhaps if a few people that are familiar with the system look at it, or we all compare our curls, we might be able to figure it out. Then again, it may be some time before our hair gets to the point that we are fully able to ascertain our true hair type. /images/graemlins/smile.gif