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.
 
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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