> What are you supposed to do when the bloc rules imposed upon you now, are not the ones that were agreed upon when you joined?

Those rules are not conjured from thin air. They are proposed either by EU commission or EU council, and the national governments have direct participation on both, including veto powers.

And ultimately, a country can article 50 if the rules are unacceptable.

> Imagine your landlord or employer changes your contract without your consent and just tells you to walk if you don't like it.

Depending on the country where you live there are regulations, but employers in particular do that all the time.

> I'm old enough to see how the EU of today is not the same it was just 20 years ago.

Age presumably brings wisdom. Not always.