In my anecdotal opinion its mostly the English people who aren't proud of their country. Most other people are proud.
Share of people in select European countries who are "very proud" of their national identity in 2017
https://www.statista.com/statistics...oud-of-their-national-identity-by-eu-country/
We're third from bottom. Only Belgium, which isn't really a country formed in the regular way, and Germany are below us.
Did you vote in the 1975 referendum for a united europe?
I can understand your position and outlook, and I can see where you're coming from. But it has some contradictions. Not being proud of being British, and not caring about history other than for learning. But on the flip side you're proud of your multiple nationalities? Why are you proud of them?
I'm wonder if our definitions of nationality are different. When I say nationality I'm talking about the people and the culture, which it sounds similar to what you're saying with cultural and diversity. When I went to the US I felt more culturally English/British as American culture is different than ours.
When I think of Scottish, Irish or Welsh people's I don't think of their political system as being part of their identity. I look at the people and their history.