For myself, I truly understand the depression and despondency of living in a conquered and subjugated country. This is how I feel about Britain's relation to Europe. Having no control over who comes into this country, is exactly the same as a country that has been conquered, it makes no difference that Britain has been tricked by treaty rather than losing a war.
The sense that the fabric of society has changed irrevocably, Britain now a land of overcrowded spaces, shortages of accommodation and loud groups speaking in unidentifiable foreign languages everywhere. Generally people trying to make Britain in exactly like the culture and country they came from.
It's depressing in the same way as a proud and dynamic business owner signing a dodgy contract and finding himself an anonymous wage slave with no power and no control over his businesses destiny.
The most painful blow of all is the British citizens determined to their dying breath to give Britain a way, let it be swallowed up by a European super state. It's as painful as a parent seeing their own child denounce them to the authorities in some hideous totalitarian regime in history.
All the while more people come to Britain, delighted to be here, adventurers staking out claims as if uninhabited lands to be colonised.