I have lots of reasons. I would like us to have control of our destiny. The EU is not democratic. They are in control of our affairs, but there is no way of voting them out ... like you would with a rubbish government.
I voted to join the EU in 1970s, but this was not what I signed up for. I voted for single market and international cooperation, for security. But they are trying to federalize Europe. That's not what I voted for. I feel conned. It's became a political project.