My clavicle bone is protruding outward & sore, i've had this for years, the pain comes & goes, but bone is getting biggger, could this be bone cancer?

Sounds worrisome: I wouldn't delay seeing a local doctor with those symptoms. It could be an old fracture evolving (if you had an injury), but less likely since it has been for years. There are both benign (non-cancerous) bone tumors and cancerous bone tumors (various bone sarcomas). You need a simple X-ray of the clavicle area and to be evaluated by an orthospedic surgeon or sports medicine specialist.