Im a 25 year old male, taking symbicort for 2.5 years. one puff twice a day. I just had a spirometry test and my FVC is 85% and my FEV1 is 80%. Took the reversibility test and saw no improvement. Doctor said i might have light asthma or none at all, im just on the low side of normal. However I looked up that if there is no improvement when taking the bronchodialator, then that could be COPD? since asthma is more reversible and should show more response to the brochodialator. Am I interpreting this wrong?

Age: 25
Male
Medications: symbicort