Talk to Pulmonologist / Lung on Respiratory Problem

So basically, I have been facing an issue for quite some time. I am thin, but I experience extreme breathlessness within a minute of even light jogging at a slow pace. I have been trying to improve my stamina for a long time, but it is still considerably lower than that of my fellows, even though I am putting in effort to improve it. I don't face much difficulty breathing during weightlifting exercises at the gym.

What I suspect is exercise-induced asthma, but I am not sure. So, why might I be experiencing this problem, and what should I do to improve my situation?