Is it possible to have a broken collar bone for 8 days and not realize it?

I went snowboarding 8 days ago, and took a nasty fall on my last run. My immediate concern at the moment of impact was that I may have dislocated my shoulder, but I soon shook it off and figured I was a little bruised, but no worse for the wear. My whole upper body was sore a couple of days following (first snowboard trip of the season, so it's to be expected). I've had difficulty raising my left arm, but it's not what I would call extremely difficult (definitely not impossible). My shoulder and collarbone have not been improving, and in fact feel worse with each ping day, and my mobility of that arm is becoming more impaired each day. I can't really tell if it's the shoulder or the collar-bone that hurts (the pain is "burning" and radiating). I also feel like my affected shoulder is "slouching" more than the other, but part of me thinks that could be psychological. Is it even possible to go so long with a fracture and not know it? Is it more likely that I pulled a muscle in my shoulder? My insurance sucks, and I'd hate to spend money on an x-ray unless there was a real concern.