YY nooka.
The problem with basing it on "feelings" is that it's too subjective. And anyway, how is a feeling so important? You could talk about mental illness, but depression isn't only a feeling, there are biological markers which show in people with depression.
Perhaps it's like religion? Religion feels totally, tangibly real to those with faith. And for those without it seems insubstantial.
I would never profess to tell somebody that they don't feel a certain way or that they should feel differently to how they do. But I'm struggling with
You are correct that "Feeling British" is a somewhat made up thing. We've only had nation states in the last 2-4 centuries, they didn't always exist, and they gained importance mainly because of Napoleon waving his willy around. Perhaps more arbitrary for countries which have land barriers, rather than sea, but still. One can change their citizenship (can you change nationality?) if they spend time living in another country and learn enough about the language, history and culture. This is what we as humans have decided denotes citizenship. But it's a set legal process - I don't get to say you know what, I've been thinking about this for a long time and I'm French now. I really love baguette and I'm totally chic. I was drinking wine when I was five, this is proof of my ultimate Frenchness. Please call me Madame Botts from now on.
Perhaps it's like that? We made up nationality. You can supposedly do a test to figure out where your ancestors came from, but in fact there are no hard genetic markers between (esp. neighbouring) countries, and mostly it matters where you were born and your parents' citizenships as to which you inherit when you are born. So we made up gender as well. No biological markers - only for sex, and we tend to broadly assume that gender correlates to sex which is why we decided (inconveniently) to use the exact same terminology in male, female, man, woman, girl, boy, and pronouns.
I don't know that there is a spectrum for nationality, but certainly many people consider themselves to be part X and part Y. Dual citizenship is a thing. My DS is born British to British parents but being brought up German, and I expect he'll identify with both of these.
Is it helpful to make a parallel like this? I am finding it a little bit so. Certainly I can relate to identifying as a national, or a citizen, even though I can intellectually understand that there is nothing which inherently differentiates me from a person of a different nationality. There might be broad similarities or differences in appearance and ethnicity, but there are plenty of British nationals who have a non-Caucasian appearance.
But I don't know - at the same time, I feel like my nationality is such a small part of who I am. My citizenship affords me the right to vote in my home country. It restricts where I can and cannot travel without the correct documents, which seems bizarre when you think too much about it, and because my chosen citizenship matches my birth citizenship I have all of the culture and language of being brought up in Britain.
I don't really know what it means. I think I'll have to think about it some more. Would love to hear others' thoughts on the topic, though.