Welcome to Just Answer and thanks for your question. Normal TSH is 0.3 to 3.0. You are right that yours is completely within the normal range. However, we don't just look at TSH. We also need to know the level of free T4 to see how your body processes the thyroid hormone. There are a lot of reasons for feeling tired from anemias to depression, too little sleep, too little exercise, etc. The cause in the huge majority of cases is mild depression. With a TSH below 3.0, I would seriously doubt it has anything to do with your thyroid.