Pain shows up for me in several forms.
1) The pain I like:
I like getting shots. I like getting bruised. I like getting hurt on the construction site; it tells me that I'm working hard (and no, it's not because I'm a klutz). I like the soreness I get from working out.
and
2) The pain I don't like:
Things like getting burned or hitting my knee cap on the corner of a table. This kind of pain usually hurts so bad that I couldn't scream if I wanted to. The worse the pain, the more likely I am to be silent. I'll lay down on the floor and kind of breathe heavily (and deeply) as a way of trying to ease the pain.
As for moderate pain like scraping my knees, I tend to fall, usually say something like "oh, crap" because I fell, not because I got hurt, get up, bleed everywhere, and not notice much of it. For instance, when I was on a stage last year I crawled on the floor and my knee was split open by a nail that was sticking out of the floor. Because I was performing, I didn't notice it. I finished the whole scene and saw the blood filling my sock after the show. Now I know why I heard so many gasps that night. Had I realized I was flashing a bloody leg at everyone I would have done something about that... At least wipe it off.