For a 36-year-old man, an LH of 12.47 mIU/mL is slightly higher than normal and may suggest low testosterone production. It is best to see a doctor, who may check your testosterone and FSH levels and examine your testes to find the cause and recommend the right treatment.

Your symptoms, such as low muscle strength, low stamina, small testicles, premature ejaculation, and erectile problems, could be signs of low testosterone or hypogonadism, but excessive masturbation is unlikely to be the main cause. The best way to know for sure is to see a doctor for blood tests to check testosterone, LH, FSH, and other hormones, and a physical examination. Treatment may include hormone therapy, lifestyle changes, and addressing sexual health issues under medical guidance.

Hypogonadism is a condition where the body produces low levels of sex hormones, like testosterone in men or estrogen in women. Common signs include low energy, reduced muscle strength, low stamina, small testes (in men), decreased libido, erectile problems, mood changes, or delayed puberty. Diagnosis is usually done with blood tests to check hormone levels and a physical exam. Treatment often involves hormone replacement therapy under a doctor's guidance, along with lifestyle changes like proper diet, exercise, and managing stress.