I'm a 19 year old male i have pain above my left breast arm upper back and left side of rib it's been like this for about 16 days now please help?

Chest pain: This sounds like muscle pain, did you injure yourself with some sport? You need to see your doctor to rectify the problem.

See a doctor: You need a full physical examination as well as some imaging studies to work this out. Don't delay in getting fully evaluated. A good pcp would be a good place to start. Hope this clears up quickly. Best.