While you have some symptoms of hypothyroidism, you don't seem to have the main ones, such as the weight gain, constipation, intolerance to cold, muscle/joint aches/pains, etc. Of course, everyone can have different symptoms, so the best thing to do is talk to your doctor and ask for the some simple blood tests. You should Free T3, Free T4 and TSH tested... Those will tell you if you have hypothyroidism.