Goodness me such pessimism, however did we manage before the EU.
From what I remember
We had a good fishing fleet, we had effective nationalised industries and were not expected to open 'to the markets' because of EU competition law.
We had a respected industrial base which provided good quality technical training for our youth. This was before the EU gave company's incentives to relocate to poorer Eastern European countries which left mainly low paid unskilled jobs for our workers, that is of course until free movement was introduced and these were mopped up by the Eastern European migrants.
Our hospitals were fully functioning, serving local areas and ran effectively, were staffed in the main by British staff supplemented by high skilled commonwealth staff, we did not have mass migration so our infrastructure, schools, health service, social services etc. Could cope
We had council run old people's homes, good mental health care, midwifery services and district nursing.
Our universities were world class .
Yes, British politicians agreed to encourage the transfer of our manufacturing base looking for the cheap Buck from Outsourcing to a cheap labour region without consideration for the long term implications.
Yes, British politicians agreed to free movement without researching and evaluating the threat to the lower skilled Brits who because of poor education and language limitations cannot move freely.
Leaving the EU will not return UK to to the post war pre Common Market era, but it will allow some greater measure of self determination such as would the NHS have been opened up to an open bidding process (back door privatisation), had we not been forced into this process by EU? Would we still have a manufacturing base?
We need more optimism, we are well respected as a nation throughout the world, more countries know about the UK than they do about the EU. It is saddening to see so many people doing their own country down and also saddening to think that there are a such people who are so lacking in confidence and so obstructive to change that they would sooner drown in a sinking ship than join in the rowing to reach a better place.