I will say this, I certainly don't remember my skin hurting this much as a kid, but I didn't have it "everywhere" like I do now. For instance, I didn't have permanent marks where my clothes touched me, that took years to develop. I think by my twenties, when it had really settled all over my body is when it just got to be really painful.
Now, if I sit too much, when I stand up it feels like my skin is being ripped apart along the backs of my legs. I have always enjoyed yoga, but now the stretching is just too much. I am stiff and sore most of the time and when I first get out of a chair I hobble a lot. While I am only 39, I move like an old lady most of the time!
To get to the point, for me, it was something that came on as I got older and has gotten worse with time.