Have you looked at some of the injury threads on this forum and any number of others? We're talking collar bones, wrists, knees, forearms, femurs, backs, necks... you name it. Point being... you got some road rash, riding a DIRT bike on the street, looks to me like as Kiwi said, you've learned a lesson, that just involves a little skin loss. Consider yourself lucky.
I give you props tho for saying the fall off was stupid. And yes, most of us have learned the lesson the same way.