You need to post your pre-TRT blood work here with ranges and let us take a look. You said they checked your pituitary gland? So I assume you were sent for an MRI, yes? If not, then they really didn't check it. If your pituitary is clear then we need to find out if it's a testical issue (primary hypogonadal) or something else. We also really need to see a full thyroid panel as hypothyroid will cause hypogonadism.

We're throwing darts here unless you post up. Your way too young to be on TRT unless absolutely medically necessary.