Cystic Fibrosis?

CF is a inherited gene mutation disease that you are born with. You get one gene mutation from the father and one from the mother. My son is now 6 and was diagnosed at 5 years old. People with CF are usually diagnosed at birth and almost always before the age of 3. There are some cases in which there is a very late diagnosis which would mean that their case is very mild! Rare but it happens! But in your case I would not think that you have CF being how you are 19. Bacteria that attacks the lungs and could eventually cause respiratory failure is the main problem in CF. I personally think that you would have been diagnosed by now if you had cf. It is a very serious and fatal disease but treatments have come a long way to prolong life expectancy. You can have a simple sweat test to see if you have it or not! it's the only test right now for CF. But in my opinion I really don't think you have anything to worry about as far as CF goes!