19 Year old, Caucasian male needs opinion on whether at risk of lung cancer. AKA should I see doc ASAP?

Age is very relevant when it comes to cancer and is one of the most important pieces of information needed. Lung cancer is rare in young people, and by young I mean under 40, when it does occur smoking is not the cause. Clearly something is causing you to not feel well so you should see your doctor, but I wouldn’t worry about lung cancer.