To everybody asking what we would lose if we don't leave the EU:
It might surprise you to realise, but many, many people did NOT vote for Brexit because they're Muslim-hating racists, but because of concerns about sovereignty. That's the ability of the UK to run the UK in the best interests of all of the people, of whatever colour/religion/origin, who have chosen to stay or come here to live.
You can love your neighbour and be great friends, yet still not want them to decide how you run your own household (and vice versa).
What was originally sold as purely a trading agreement has shifted massively over four decades and is progressing swiftly towards its openly-stated goal of becoming an all-out superstate.
Theoretically, the EU is accountable to member states' (now increasingly puppet) governments, but in practice, nobody challenges it. Its accounts have not been able to be audited for well over a decade and nobody even seems to really be concerned about this.
Any individual national leaders who DO make a big enough fuss either seem to get neutralised by being 'promoted' to a phenomenally well-paid but faceless central bureaucratic role in Brussels or are otherwise mysteriously silenced and/or discredited before very long (Marta Andreasen, anybody?)
Without wanting to be flippant, if you genuinely feel yourself to be the victim of an abusive, controlling, overbearing and much, much bigger partner, why is it seen as so ridiculous that you might be determined to want to leave if you possibly can find a way to do so?
Of course, you know that money and other important matters will be much more difficult than if you just rolled over and stayed to dance to their tune - at least for a season - but just sometimes, people consider it a price worth paying in order to regain their own dignity, pride, independence, self-respect and self-worth.