I’m considering cutting my parents out of wedding planning. What do I do?

Long story short, my parents offered to pay for my wedding. I knew from the second we got engaged that I wanted to pay for it myself because I know how my family is and how controlling they tend to be. After a few arguments with my mom, she really wanted to be involved and promised me it wouldn’t be an issue. We found the most beautiful place and everyone loved it so we put down a deposit. Now that it’s time to make the guest list, my family feels the need to vet the 75 people my fiancée has on his list since they are paying for them. But in my mind if you have him 75 people to invite, who are you to tell him if those people are important enough to him or not? We’ve been arguing for days to the point where I told them I don’t get it and I want to pay for it myself and I don’t want you involved anymore. I’ve been stressed to the point of physical sickness and I can’t do this for the next 7 months of wedding planning. I would love love looove for my family and I to get along and for everyone to be involved and be happy but at the rate this is going, it’s hard to believe that’s even possible. They’re telling me I’m being ungrateful and a bridezilla but all I ask is for them to not control the whole thing. I understand that we’re very lucky to even be in this situation so it makes me feel bad to even be complaining since some people don’t even get to have a wedding let alone have a family to celebrate with. Tell me if I’m crazy and I will just shut up and let my mom take the reins.