What is the future of Great Britain?

Germany is currently the biggest economy in the EU it is the biggest exporter worldwide, 3 times bigger than the UK which still ranks a fairly decent 8th considering we are not suppose to manufacture anything according to most people. We (London) was the financial capital of the world before this recession this is why we have been hit the worst. If we leave the EU then we will have no future, the future of the UK depends on the EU.