I don't want to have a wedding because of my fiancee's family
What is it about your fiancee's family that you don't like?
They're uneducated and unnecessary rude to me
You should speak with your fiancee about how their family treats you. It can be painful when your partner doesn't accept your family, but if you don't share your feelings, your fiancee might be unaware of what's going on.
I'm not interested in speaking. I'm not sure these people deserve my attention.
Your partner's family and yourself should do some fun things together even if it is just a corny board game. It might break the ice somewhat and make you all see how much better it is to get along. I know you are trying so maybe suggest this one time.