I had pneumonia in 8th grade and it look me a month and a half to fully recover. The antibiotics are gonna be slow progress, unfortunately its not something that is gonna just pass over like a stomach flu. If you still feel super terrible after 2 weeks, go back to the doctor, he may have to give you stronger antibiotics if the ones you have now are not working.
Stay inside, do not go out if you have to. Try to refrain from any outdoor activities or sports, Pneumonia makes it hard to breathe and sux as it is...If you ignore bed rest and insist on going out and doing strenuous activities, you may only make your recovery take even longer.
putting the vicks vapor rub on your chest at night provides some comfort.