I've had pretty bad chest congestion for a few years now, sometimes clearing my airways of mucus every 2 minutes. gets worse in cold, exercise, indoor?

May be asthma and...: It is difficult to tell what you have, but i would suspect asthma is likely cause of your trouble. Cystic fibrosis may have similar symptoms, but should have been having symptoms since childhood. COPD is not likely in a 24 yrs old and alpha1-antitrypsin deficiency may also do so, but often in 30s-40s and smoking increase/causes earlier symptoms. U should consult doc for eval/treatment. Good luck.