Left Breast And Shoulder Sore My Left Breast Hurts, Does Anyone Know What's Wrong With It?

My left breast hurts, does anyone know what's wrong with it? - left breast and shoulder sore

On weekends, I have the exercises for those who cling to the bars and the foot into his stomach and I feel a little pain in the shoulders and armpits, is that what he did? I feel that my nipple is about to fall. Who knows what is bad and if you go? oh, I'm 16 years old and I wear a sports bra all the time