Hello Mr Chawla,
I understand your concern about the shape of your nose and nose block.
I do not exactly know what surgery you underwent at age 12, but a septal surgery is never performed on a growing nose as it can interfere with the growth of the septal cartilages and cause deformity
. The best bet for you would be to visit a rhinoplastic surgeon, who will examine your nose in detail. Both the internal and external nose needs a thorough evaluation and further needful. Hope this helps.
Dr Vaishali Mehta