Too small? Fifth largest economy in the world. A nuclear power. By your thinking there are only four countries fit to stand alone. Nonsense!
Just quit the grandstanding and try to use your brain. (I know, it's a vain hope ...)
The following numbers are thousand million dollars (in other words you have to imagine there are 9 noughts following the decimal point) and they have come from the United Nations in 2014.
In order of GDP the largest economies in the world are:
1 European Union 18.5
2 USA 17.3
3 China 10.4
4 Japan 4.6
5 Germany 3.9
6 UK 3.0
OK, the EU value includes the UK, but the UK only accounts for 16% of the GDP of the EU. That means that 84% of the EU's GDP is due to its other members. The rest of the EU is five times as large as the UK.
The USA is five times the size of the UK and China three times.
And you think that we are a major player in world terms? No, we are just one of the fattest mackerel being rounded up by the sharks for their dinner.
Name one thing that can be called a disaster.
How about the steel works in South Wales that Tata closed just before the "referendum"? The xenophobic folly of the South Wales voters has totally screwed any chance of a buyer being found. It has also possibly ensured that the UK ceases to be a steel-producing country and will now be subject to the whims of the market - dominated by China.
Oh, freedom from the grip of the EU is so refreshing. We can take our place on the world stage - in the prompt corner.