No it's not flint, but it doesn't appear to be sandstone. Not knowing your area, I'd say it's a type of quartz. Not all points and tools were made out of what people call 'flint', or chert. If it was a hard rock and susceptible to working, they might use it. I have artifacts made from obsidian, crystal quartz, poor quality quartz, petrified wood, and sandstone. They tried to get to areas that had high quality lithic materials and also there was extensive trade for that sort of thing. But in a pinch, they could make use of locally available material, and it wouldn't have the look most folks associate with the classic 'flint arrowhead'. Your piece doesn't show any evidence of flaking, but it could be something struck off from a large cobble in the reduction process.