KitKatarina, if you really want to wear gloves, then by all means do so. It's your wedding and you should have it exactly as you want, so don't give up hope just yet.
You can powder or corn starch your hands prior to putting your gloves on. That should help keep the sweat under control on a short-term basis. There are other tricks that folks who wear gloves on a profession basis do in order to make their hands more comfortable in all sorts of weather conditions. Search the 'net to see what comes up.
I would discuss this situation with my doctor to see if he/she had any recommendations regarding how to overcome sweaty hands during a wedding ceremony. The ceremonies in Disney normally run about 15- to 20-minutes in length. That's pretty quick and you might not be as uncomfortable in gloves as you think.
Anyhow, just something to consider in case you really have your heart set on wearing gloves.