Well, it’s all about sovereignty, innit. We want our country back.
But Britain is a sovereign nation. The only body that can make laws for Britain is the government of Britain. Sure, many of those laws have to be aligned with the EU but Britain can say no, it can opt out when the country feels sufficiently strongly.
Britain opted out of the ERM, opted not to join the Schengen area, opted not to join the euro (currency). The EU cannot control Britain’s borders, only the UK can do that.
Think on this: if the UK had lost is sovereignty to the EU, would we even be having this referendum now?