I believe most people with primary HH noticed it when they were between 11-14. Some can remember having it since they were small kids. If yours presented itself at an older age, I'd suspect a treatable medical cause.
I'd go to your doctor and request a physical, as well as blood work. I'd definitely get CBC, metabolic panel, thyroid function, and preferably hormones like testosterone and estrogen. If you have insurance, great! If not, check out healthcheckusa.com They're WAY cheaper than if you just go to Labcorp with no insurance. Those bastards will put the screws to you.
Anyway, basically, you want a full blood work up. Go for it. There's no reason to suffer with this if it can be treated. Good luck!