For
English not being your native language, you do awfully well with it.
Your symptoms are definitely those of hypothyroidism and your antibody tests would be basis for a diagnosis of Hashimoto's Thyroiditis. With Hashimoto's, the body thinks the thyroid is foreign and produces antibodies to destroy it. The destruction, typically, takes quite a few years, but as it happens, your thyroid will continue to produce less and less hormones, as healthy tissue is destroyed.