Ok, 27 pages of comments? TL;DR, so sorry if this has been well covered by now, but some of the responses have ruffled my feathers a bit, so here is my 2 pence..
It's ok to be proud of being married. It's ok to be proud that you've made a legal/religious commitment to a man, and that they are your husband, and you their wife. It's not for everyone, and that's fine. Being married does not make you superior to anyone who is not married, either by choice or by circumstance. It does not mean that your love is stronger, that your relationship is more stable. Just as much as some married couples do have a better, stronger relationship, so do some unmarried couples have better, stronger relationships. It comes down to preference.
Just as your title comes down to preference. Ms is technically correct for any female, married or unmarried. I understand why it is the default title companies/businesses use. However, when you have provided your full personal information to a company, ticked all the boxes and filled in all the details, those details should be respected. If I say I am married and my preferred name is Mrs DH'sName, then respect that, and call me that. If I am married or single and choose Ms Name, respect that too. Defaulting to Ms regardless of the person's choice is rude, and frankly would indicate bad service to me by ignoring what they've said. What else that you say to them will be brushed aside so casually?
So, OP, you are not being unreasonable. If you are happy with the choices you have made in life, be proud of them. Anybody who feels the need to nitpick and sees your opinion as being subservient and anti-feminist has overlooked the importance of the right to choose. If you take away choice, we go back to being forced into a pigeonhole. Choice gives us control. That's something that men do not have when it comes to their title. Hardly equal, is it? So perhaps we should consider ourselves lucky on this front.