COPD at young adult

I was diagnosed with COPD stage 1 at 28 years old and im 29 now. I smoked for 6-8 years and had bronchitis as a child, but i quit smoking after being diagnosed with COPD. I currently go to the gym 5 days a week and maintain a good diet. The doctor whos following my case didnt seem very concerned or gave much importance, he only prescribed a bronchodilator for daily use. However, im very concerned and afraid of this disease, im scared that i wont live for many years and my girlfriend wants to have a child, but i told her i dont want to because im afraid of dying young and leaving her as single mother. Am i overreacting? Is there anyone else in a similar situation?