You should not be worried. Everyone has a thyroid unless it's been surgically removed.
Diagnosis cannot be made over the internet. Without complete testing and posting the results and ranges, even a suggestion of what could be wrong cannot be made. It could be your thyroid causing the sensation, or it could be something else. Which thyroid test(s) did you have?
There is not just one thyroid test used to determine the status of your thyroid hormone levels, there are three used together in a group. Thyroid tests are not negative or positive. Each test measures a particular hormone and your results are a number which falls within, below, or above the lab range. There are two thyroid hormones that are tested. The only tests that should be used to measure your actual levels are Free T3 and Free T4. The other tests for these hormones are used for other purposes. TSH, a hormone from your pituitary gland, is also measured at the same time as the free hormones. The only thyroid related tests that are considered negative or positive are thyroid antibody tests. These tests determine if you have autoimmune thyroid disease. If you are within range, you are considered negative for autoimmune thyroid disease. If your results are over the lab range, then you are positive and you have a thyroid autoimmune disease.
Did your doctor do complete thyroid tests? During the exam, did they feel your neck to check the size of your thyroid? Do you have any swelling in your neck?
Besides that feeling in your throat, do you have any other symptoms?