I'm a 25 yr old f: I have a lump/1 side seems raised higher than the other side under my left breast but on the upper part of my rib cage is it normal?

Well, no its not. Normal but at 25 the cances of it being cancer are verrrry low. It may be a cyst or what's called a fibroadenoma. Your doc would probably order an ultrasound or try to aspirate it with a needle if he thought it a cyst. Good luck.