You are new to riding so likely we can assume you bought a used bike. Do you know when the oil was last changed? The previous owner may have changed oil and put in car oil that is not compatible with a wet clutch design in most motorcycles. If you don't know when the bike was last serviced then you might be well advised to change the oil and oil filter. You can use a motorcycle specific oil or a diesel oil such as Shell Rotella.
Hope it's only a clutch adjustment but the wrong oil will make the clutch slip too.
A wise investment in your time will be reading over any service threads and How To's on the forum. The GZ is a fairly simple bike to service and just needs a little TLC now and again just like other mechanical devices.
