welcome to HealthcareMagic
Man boobs or Gynaecomastia
is a hormonal
problem so it requires treatment to regulate the hormonal imbalance caused in the body.You should have consulted a Endocrinologist
in or near your city who will examine;investigate & treat you.Since you are having this problem from 12 yrs of age it is necessary to get treated.The second thing is that if man boobs stay for more than1 year then it is difficult to reduce the fat around the breast by exercise;medicines;or diet.Surgery remains the only option in such cases of long standing gynaecomastia.Please consult a doctor for treatment & if required you can get it corrected surgically as it is a cosmetic surgery & does not leave big scar on body.
Think over it & get treated.