You said you don't want other people making our rules, but that isn't how global trade works, as whether it's bilateral/multilateral trade deals or the single market, there are rules that govern how parties to those arrangements can operate. When you trade globally, there are rules and standards that make that trade function, and that's a good thing. It makes sense and has delivered tremendous results for the world.
I mean I was with a bunch of Scandinavian data scientists yesterday, most of whom worked for multinationals, and it's blindingly obvious that for the data within their business it makes perfect sense to have common standards, common nomenclature, common processes so that everything works together. Local teams don't complain about not being able to do their own thing as they need to work together. You then extend that to the wider supply chain, where it's increasingly common for standards to be filtered down through the supply chain, whether it's manufacturers mandating lean or Microsoft mandating maternity pay. Again, those in most instances make perfect sense as the ecosystem needs to run smoothly together.
That's essentially what the common market does, and it allows for this level of integration like no other trade deal on earth.