You've almost answered your own question. Your outdoor shots are great, but
indoor shots are blurry. That suggests camera shake, since the shutter
naturally slows down due to the lowered lighting conditions. As a test,
place the camera on a tripod (you do have a tripod?) indoors, and try
shooting with the camera stabilized. If your shots come out better, it is
definitely camera shake. You have to realize that while an indoor scene
might appear sufficiently "bright" to you, it is probably dark to the
camera. The general rule for hand-holding shots is to be sure the shutter
speed is at least the reciprocal of the lens' focal length (when converted
to equivalent for 35mm camera).
For example, if you have the equivalent of an 50mm lens (or the zoom is
set at that position), you need to have at least a 1/50 second shutter
speed. Check your camera's manual to find out what the 35mm camera
equivalents are for your lens.
A second possibility might be an inability of the camera to focus under
dark indoor lighting conditions, but that depends on the camera, and I know
nothing about your Sony's low-light focusing capabilities, so it's just a
suggestion.
(--and if you don't have a tripod, set the camera on a table or other
stable flat surface and hold the camera still while shooting from there).
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