Low fsh levels and pituitary gland.

I am 18 years old with history of some months of anorexia when I was 13 . I never had morning erections. Tested for testosterone . Total testosterone was 850ng/dl . But free testosterone was very low at 1.7 ng/ dl , which is not even 0.2% of total testosterone. I also have libido issues . I tested prolactin being normal . Then I tested FSH it was low around 1.4 miu/ml . It should have been above 1.8 miu/ ml . I consulted some doctors ,they just say to be active but I have already been going to gym and eating very good diet for past 2 years . I fear any pituitary gland problem . So I tested for thyroid and SHBG suspecting any liver problem . I know it is excessive yet my bad history during puberty makes me anxious of any potential developmental issues since my FSH is crushed .