Ask yourself this, "Did I enjoy the pain?"
"Did I keep going so that the injury would get worse?"
"Would I try a stunt for the sole purpose of injuring myself?"

If you answer yes to those, then yes, you probably do have a SI problem, but my guess is that you will answer no. There is some difference between pushing beyond your boundries at the expense of an injury so that you can excel at your sport and purposely injuring yourself. I can't say that continuing to push after you have suffered an injury is a good idea, but most extreme sport athletes have a history of breaks, lacerations etc. Keep in mind though, that if you injure yourself and keep going, you run the risk of permanent damage that will lead to having to give up the sport you love. Make sure you take all the precautions available to protect your body when you are doing stunts.

I'll end it here as I'm starting to sound like a parent.

Sam2