How can I get over my wedding day regrets?

Even though it has been over a year, I still have big regrets about the big day. I had an outdoor ceremony planned and of course we woke up to gray skies and rain. We had to move our ceremony inside into an awkard long room with no windows. The officiant was completely monotone and emotionless. He mumbled the whole time, never looking at us or the guests, and never smiled or showed any expression. At the end, he even had to flip through his book to remember what our last name was to announce us. When I go to my friends' weddings in gorgeous churches, instead of being happy for them, I feel sorry for myself and get depressed. I love my husband with all my heart and am thankful for him, but can't seem to get over these regrets. I spend a ton of time replaying the wedding in my head and thining about how I would do it over if I could. I wish I could turn these feelings off, but it doesn't seem to work. Even when I see a dress I like better than mine, I get down. Any advice?