"An abnormal result does not mean you are sick: A test result outside the reference range may or may not indicate a problem. Since many reference values are based on statistical ranges in healthy people, you may be one of the healthy people outside the statistical range, especially if your value is close to the expected reference range. However, the abnormal value does alert your healthcare provider to a possible problem, especially if your test result is far outside the expected values." - Lab Tests Online - Reference Ranges and What They Mean
In trying to assess a person's thyroid status, the most important consideration should always be an evaluation for symptoms that occur more frequently with thyroid problems than otherwise. You stated you have no symptoms. Beyond symptoms blood tests for TSH, Free T4 and Free T3 are usually done first. In the future you should make sure they always test for Free T3 along with others. Your TSH is very normal appearing; however, TSH is a pituitary hormone that really does not correlate well with actual thyroid hormones or with TISSUE T3 EFFECT which determines your thyroid status. Your Free T4 is above the listed range; however, the range for adolescents is somewhat higher than adults. Your TPO ab was negative. You did not list a result for thyroglobulin antibodies. At any rate, there is nothing in the info provided to be concerned about at all.
So I have to ask why you were even being tested for those?