Since your car IS 8 years old it wouldn't surprise me that you have "fall-out" on your paint.
the environment wreaks havoc on any paint surface over time. Acid rain, chem. salt etc.
If you don't know what you are doing with that buffer; you can really screw it up and make it worse!!! Take it somewhere that has experience with this stuff. a reputable shop who knows how to wet sand and/or cut and polish the surface without burning through. I would think this would be the first go over the paint so there is lots to work with. Keep in mind when you cut and polish you are stripping very fine layers of clear coat off the car.