You are confusing EU with Europe
"After tonight, I will no longer be a European citizen"
Actually, you will. You will no longer be an EU citizen.
It's the same confusion that causes the pro-EU camp to call the critics of the EU "europhobes".
I am not afraid of Europe, I deeply love Europe (including the UK).
And because I love Europe so much, I want a better EU.
And it is concerning that even the departure of the UK does not cause alarm in Brussels and makes them consider listening and changing.