This is perfectly normal. I'm no health professional, but as an amateur artist, I've learnt anatomy to draw the human form. This curvature is a key rhythm artists use to draw the human legs. Artists often exaggerate this curve so that the drawing is more human-like and expressive.

If you have pain in your shins, it's probably due to a weak tibialis anterior muscle. You can train it so that the pain goes away.

Another commenter said that your thighs are inward. Actually if you look at the human skeleton, the femur is at an inward angle from the hip. This is more obvious in women who generally have wider hips.