If you think Leaving would cause the UK to take responsibility for our own mistakes then you are an incredibly optimistic and dare I say it, naive, person.
Instead of the EU, the trickle down racism that stems from the Leave campaign will become the route of all our ills. Not stuff that the UK does. A classic example is the pressure on health services argument. 14.1 million GP appointments per year are not turned up to in the UK, and our GP numbers are falling as a result of UK Governmental polices, meanwhile, 5.6 million outpatients appointments were missed, and yet we keep hearing that the issues with access to health services are down to growing numbers of immigrants.
Likewise, with regard to social housing, there is a perception that Eastern European immigrants are pushed to the top of the social housing ladder ahead of UK locals. The numbers simply don't bear that out. The reality is that we don't have that much social housing as a result of successive Labour and Conservative policies. But that is our fault and our responsibility. Just shutting out the EU is not going to change the perception that it's immigrants causing the issue, and the leave campaign mantra has, if anything, made that worse.
We're not very good at taking responsibility for our own failings.
I did not mention immigration because I think it is a good thing for this country and everyone including you have just taken the surface figure and jumped to the wrong conclusion, I don't have the exact figures to hand but the last time I asked, I think it was about 1/3 of all immigrants turned out to be full time students at a University or College here in the UK very much a success story in my book, another section which never gets a mention are those migrants who are included in the figures but are passing though to other countries such as American, Canada and Ireland or going the other way to other EU countries from America etc.
You can not just blame migrants for not turning up at GP appointments most of them would not be registered at a GP surgery in the first place, but if they are ill they may well use A&E as a first step.
You said I am naive to think we could do better outside of the EU, to be honest I don't think we can until we get rid of the self self self culture which has built up in so many peoples lives, I suggest you might like to read the following:-
https://www.theguardian.com/books/2016/apr/15/neoliberalism-ideology-problem-george-monbiot
My beef is that we all take the NHS for granted (I did work in it for eleven years) and it could not cope with the pressure on it then. The NHS was not designed to copy with the likes of long term conditions such as Cancer and Diabetes, we have to find another way for this to be funded.
But if you want to go down the American heath care route that's find, stay in the EU and wait for TIPP to take effect as you will then be paying for everything. I have friends in America who are envious of us in the UK and our Heath Service, Diabetes UK is a Charity and it raises funds from the public. If you where in American you would have to pay for the same advice that we get here for free. I have been told that sites like this one have a number of folk in America who regularly look at what we are doing and feel happy that they can access this information.
I am not anti America far from it, but this proposed trade deal between the EU and America in my mind brings the worst out in everyone and that is my reason for wanting to leave before it take effect.
This whole debate is not as simple as some try to make it, you will like some parts of the pro EU campaign and you will also like some parts of the Britexit campaign. Only you will know which bits they are that you like.
The biggest failure of the EU was not a case of becoming more political, but not taking care of different cultural concerns.