Nikon D3300 DSLR Camera Dark Images?

Hi
Today i have just bought a Nikon D3300 DSLR and need some help. I was using the camera fine and getting amazing photos. This is where i made the mistake of attempting to explore the camera more. Now even in the bright sun outside the photos coming out are so dark you can just see an outline of what im photographing. On the readings it says the image is too dark and the exposure marker is going past -2. This is even after ive opened the Aperature to 5 (Biggest opening possible with lens), Put the ISO on 1600 and put the shutter speed to about 1/60. I want to take photos of fast action e.g. Car racing but i cant even take a still photo without blur due to long shutter speed. What do i do?

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