Imagine you went along to the local politics club. EU referendum.

I joined a chess club years ago and went along to play mind games. Won some games when I shouldn't have by Bluffing that I was doing stuff on the board that was threatening when it wasn't. Sometimes I played good, sometimes I was dreadful. Every week I paid the dues. Most of the people there were nice but one guy sickened the whole club for me. He had two minutes left on the clock. And he had a losing position. If he moved his only pawn his position would be flooded by the enemy side. Instead of resigning he stopped the clocks and declared a draw. The position was drawn out on a form and both parties laid out their positions and the game would be posted to an arbiter to decide the outcome.
WTF. three hours of mental torture and you can't back down. You have to assert domination?
I left the club soon after. I decided I did not want to be part of something that takes itself so seriously. It was a game that was turned into a way for people to brow beat each other.

Leave the club. What has the UK to prove by remaining. If our goods and services are good, we don't need middlemen to sell them. We have infrastructure. Resources and scientific know how.
Stop fearing that we can't make it without being part of some Club.