You know when you are true sub when......? In my case. Getting excited about getting a new cage . How about you ? .
In my very early twenties, getting my first caning from a Domme, enjoying it and wanting more. Seeing the film Maitresse and wanting to experience that domination. Wanting to be disciplined and controlled by a beautiful, elegant woman. True sub?? Not sure if I ever got there, too much alpha male in me. But I have always enjoyed the Dom/sub activities.
You find yourself doing things you hate and enjoying doing them well because it gives you pleasure to do them for her.... even if she does not always even aknowledge you've done them.