Hello!
I read carefully your problem and I can understand that increasing your high is very important to you.
Height of an individual is determined by genetics,nutritional factors and
hormonal factors such as
growth hormone.
An individual stops growing in height after the fusion of the Epiphyses of the long bones, which occurs by the age of 18-20 years in males.
Considering the fact that you are 23 years old your doctor was right when he said that your bones had already fused and neither food supplements or specific exercises can have an obvious effect in increasing your height.
If you are very determined to increase your high I can suggest to consult an Orthopedic surgeon because in your age the only way to increase height is surgery.
The method is called Distraction osteogenesi(or Illizarov technique),is a surgical process used to reconstruct skeletal deformities and lengthen the long bones of the body. A corticotomy is used to
fracture the bone into two segments, and the two bone ends of the bone are gradually moved apart during the distraction phase, allowing new bone to form in the gap.
Hope my answer helped you.
Take care.
Dr.Rovena