if i were looking for a kinky IRL couple... maybe looking for bdsm clubs? im sure ur not the only one and atleast people u dont have to swim around vanillity. Although... for me going to those clubs alone chould be one of the most embarrassing things i could do, but... hey, facing embarrasement its part of the game, isnt it?
Online groups as subzero said whould be the easiest way but, if u are looking for a dom, actually exposing you to the clubs could be appealing. It shows bravery, as for me: my dom side likes brave people.
its like: huh!! shes brave, i wonder how much.
AS for what Andyswitch proposed, i dont know... getting to know some1 to the point where u can discuss kinks sounds like a tedious job. Maybe u start liking some1 that is not into sm and it leads you to a realtionship that u didnt look for.