How would i know if i have pneumonia without going to the doctor?

May be difficult: It can be difficult to tell the difference between pneumonia and less severe infections, but pneumonia typically is more severe with more cough, mucous production and fevers. Bronchitis tends to be more mild, but if you have underlying COPD or other lung disease it may be more difficult to tell. A chest xray/physical exam can help distinguish, and you may need antibiotics. Would see a doc.