The country was an inefficient mess before brexit and still is. Almost nothing has changed, for the better or worse. Perhaps brexit happened to coincide with the point in time at which you took an interest in politics and became aware of how bad things are, I don't know.
If you were old enough to remember a labour government then you'd know that things aren't very different under them either. Labour usually gets elected by those who are too young to know what they're actually like so will believe their promises.
But brexit has little or nothing to do with this thread.
Most people are not pro or anti-brexit, or pro or anti-tory, and generally don't care much either way between elections. You are having a solo shouting match that nobody else actually cares about or wants to listen to.