my car is leaking under the car i dont know where please help?

What is leaking? Brake fluid, anti-freeze, oil, power steering fluid? Where on the engine is it leaking? If it is ant-freeze, and leaking where the water pump is located, it very well could be the water pump. Chevy has had issues for decades with oil leaks, and your car being 8 years old, may have developed an oil leak around the intake or valve covers. If the leak is oil, check the heads if you can and see it that is the source. Transmission fluid? Guess where it is leaking from. The A/C will leave water under the car when it is shut off from condensation. It may be that. I sure hope so, then you can keep on trucken and not have a worry. If you not sure what type of fluid it is, get a clean old rag, wipe some uop and take it to a GOOD reputable repair garage and do a show and tell.