Girl you may have issues with your pitituary / hypothalamus that causes it not to send enough ACTH to your thyroid as well as adrenal glands causing you low TSH, low other level (T4 and T3 is way more important) and low cortisol!

I am investigating that. I have 2.8 though in TSH and have finally found a doctor in Sweden, willing to get me down to a lever closer to 1!