I've been trying to wrap my head around the possibility of having asthma. I'm 30 and just got some tests done - like the x-ray and CT pulmonary angiogram - and they both came back normal. I also did a Spirometry test, and my FVC and FeV1 values were above 110, which should be a good sign, right? The doc mentioned I have a mild wheezing sound now and then, but not always. I even did a six-minute walking test with jogging, and my spo2 levels before and after were 99 and 98. I usually climb four floors, do brisk walking, jogging, and some skipping exercises without feeling breathless, although sometimes I think I might get breathless, but it never really happens. Should I be worried about asthma, or could it be something else?