Could this be Asthma?

Patient: I recently had a PFT done and found out that my total lung capacity is only 64% and my lung age is 66 years. I am a 23 year old female who rarely ever smokes. I have also been experiencing lung tightness, shortness of breath, which is sometimes when bad associated with a cough and inability to talk well to others. Could this indeed be asthma as pulmonologist stated was possible? Though he did say he didn’t think it was likely in my case.