hi,welcome to health care magic family.
as per the standard chart at the age of 21,ht 150, weight should bet 39 to 52 kg,so you are little bit over wt,for that you are not to be worried,make a point that now your wt should not be increased.
avoid fatty food,more carbohydrate
and do some exercise.
for depossitation of fat in belly and back you do leg raising exercise for about ten mnt,morning and evening