sore collarbone

I'm 15 and have been working out for months and yesterday I went to the gym to see if I would like to get a membership there. I did a whole upper body workout so I could sample most of the equipment. This morning I woke up with pain in my left clavicle. The pain isn't really bad but I haven't had it before and I was wondering if anyone knows how it could have happened.
 
You probably just over did it
 
It's probably just soreness in one of the muscles attaching to the clavicle. Unless it seems to be sticking around a long time, then don't worry about it.
 
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