I was diagnosed around age 4. I simply was not growing sufficiently (falling behind on the average growth curve). I was referred to a pediatric endocrinologist that, among many other things, perscribed me daily growth hormone shots so I could grow to 5′2″. When I was 12, I had to start on estrogen to aid me through puberty.
The doctors appointments and such were challenging for my whole family. My parents divorced when I was young (not saying this is why).
As an adult, my greatest challenge has been knowing I am infertile. Most of the people I know are married and starting families. Dating is rough when I have to tell a partner I will be adopting if I start a family (and I have been left over this before). I have a sister that considered being my egg donor in time but decided against it. This hurt but was completely understandable.
Most people (even my family) are oblivious to how heart wrenching this can all be.