That's really, really interesting. I've never known an SP who wasn't creative. Perhaps you are creative, and it's so natural and inherent to your nature that you don't even realize it. I have a very impulsive friend who was taken aback when I asked her if she was impulsive, but upon further discussion, she blurted out "But that's not impulsiveness, that's being human!" She is impulsive, to the point that she can't imagine being any other way. So maybe you really are creative, but you can't see it.
Or, you really are entirely uncreative. In that case... you're either a really unique SP or you are mistyped.
Nah, I'm probably mistyped. I typed myself. Every time someone tries to help me, it points to ISFP, but I could just not be revealing about myself what needs to be revealed in order to type me properly. Who knows?