It is hard to decipher if you have bronchitis, COPD or asthma without doing a full consult with your pulmonologist as these diseases often share similar attributes/symptoms. How long have you been experiencing your problems, what sorts of symptoms do you have, are you currently on any medication, do you smoke, do you live in a smog-filled environment, are you exposed to air pollutant where you live/work? these are some of the many questions that is needed to help diagnosing your problem.
You need to c a pulmonologist (lung specialist), he can perform the necessary tests to tell you what you have.