Yes, I have asked myself why it is so important to me to identify myself as married, and it is because it is a significant part of who I am. Being Mrs SDTG shows my commitment to my dh, to our marriage and to our family. I feel that this is important - but I fully accept that others don't want the same symbolism but are equally committed to their dh/dp, family and marriage/partnership.
Being Mrs means that someone loves me. It's an affirmation of my importance to dh - and to be honest, I have never felt important to anyone. I was bullied at school and always felt like a reject, someone outside the circle, not accepted. Being Mrs means I am part of my family circle, accepted, in the loop.
Here, on this thread, I feel rejected for having a different opinion, not good enough to have my choice considered alongside yours. Looked down upon for accepting something that is an archaic practice of the patriarchy (which, by the way, was not news to me).