My Bones are cracking?

I am a 26yr physically active female and since I can remember, about 7, probably earlier, my bones crack. When I walk, my feet involuntary crack, when I take a deep breath my upper back cracks, my hips cracks, etc. It is not painful when this happens, but I am concerned if this is normal or should I see a doctor about this. Also, my mother feet cracks when she walks, so I don't know if its hereditary. Can someone give me some advice on what this might be?