When I was 1st diagnosed with emphysema 16 years ago my FEV 1 was 62%. It is now 48%. i believe NORMAL for your age should be 80%. Go see a pulmonologist. Most family Dr.s really don't know much about emphysema.
I was having SOB, so Dr did a spirometey, which I failed (FEV1 64%). Was prescribed Breo inhaler, now have burning sensations. Dr ordered CT, but that came back stating no acute abnormalities. I know COPD is emphysema and/or chronic bronchitis, but Dr said CT scan showed neither.
If you smoke stop. You haven't provided enough information to advise. You could have small lungs or asthma. A negative CT is reassuring.
Stay well.