Am I going to look like an idiot?

A few weeks ago, I was looking for someone to marry us. The pastor had suddenly cancelled. I asked my principal to do it. He and I have always been close, he has helped me through some of the toughest times in my life, AND he's an ordained minister. I asked him, he said he'd be honored! Well, in communicating that to my oldest sister, she let me know right away that I had hurt her feelings. Why didn't I ask her? (She performs weddings, but did not go to seminary or anything, as does my ex husband.....) Anyway, I was completely honest and told her several things:
1. I feel more comfortable with a man marrying us. All of the religious figureheads in my life have always been men. I know and appreciate that women can do it too, but I just personally prefer a woman, right or wrong. (She let me know that was wrong, btw.)
2. I wanted someone that has my religious beliefs. Even though we don't go to church every Sunday, I pray to God every single day. I am deeply driven by my faith in God. I know to most, I don't have the bible-toting, bible-verse quoting appearance....because I don't. But my faith is what gets me through my life. My faith in God. I believe God plays a huge role in keeping marriage together, and it's important to me that someone that shares that exact belief marries us. He does, she doesn't. She told me that I don't even know her religious beliefs, and I told her she's right (which I should if it was a driving force in her life), but I did know that she had dabbled in Buddism. Again, she was mad at me.

It was at this point where she let me know that the reason she refused my offer for her to be in the wedding was that she thought it was "stupid" for "older women" to have weddings. She thought it was dumb for my mom to do it. She thinks it's dumb for me to do it. I told her I'm not "older"...that a lot of women get married for the first time at my age, and Tony has never been married, so I thought it was fine. She said "older women" look tacky up there wearing bridesmaids dresses. (including my other sister, and one of my best friends that are both over 50 and doing it!)

I guess now, 3 weeks before the wedding, I'm starting to panic. How many people are going to look at me and think I look ridiculous? How many people are going to judge me and say "she shouldn't be doing this again?". I just think it's not fair to Tony. He wanted all this. He wants to celebrate our journey with friends and family. And even if I have had it before, this is so different, and it's been 15 years..... don't I have the right to be happy and celebrate? Is there a limit to the number of "happy events" one can have in their life?