So it's not hereditary, it's not your diet... It could be that you're just a naturally wobbly person.  Most people exhibit a certain amount of wobbliness.  In most individuals it takes the form of a slight tremble, or an occasional shimmy, although in a few isolated cases the degree of oscillation can be more pronounced.  Nevertheless, it still remains within the strict parameters defined by the International Council on Human Wobbles, Undulation and General Jiggliness.  Sorry, it's just the way you're made, and your going to have to learn to live with it.