You're taking all of this way too personally dude. Your SJW worldview has blinded you to common sense. But anyone with common sense knowns you're not an accurate representative of "the Scottish people." I mean, c'mon man – Scottish people aren't ethnically Middle-Eastern, they're not "brown," and they aren't Muslim. On top of that, you appear to be completely unaware of Scotland's history of rebelling against the Crown. You don't observe any of those weird Celtic holidays and festivals. You personal history is devoid of celidhs, traditional Scottish dance, Gaelic drinking songs, clan rivalries, or Highland-style attire, except for maybe an argyle sweater (which you wear during football matches as a sarcastic show of Scottish patriotism). Your only connection to Scotland is the fact that you were born there, and you speak English, perhaps with a Scottish accent. Maybe you tried haggis once and hated it.
I know it stings, but you're not a rightful heir or custodian of Scottish culture, or any European culture for that matter. You're kind of like Tom Cruise in
the Last Samurai. Is Tom Cruise's character "Japanese," just because he took up permanent residence in Japan and became Samurai? Of course not. If Japan were suddenly flooded with Caucasian refugees, are the children of these refugees capable of carrying Japanese culture and traditions to the next generation. Of course not. Likewise, the flood of Middle-Eastern and African economic migrants that have taken up residence in Europe are not true "Europeans." Given their numbers and political influence, they are corrosive to European culture and traditions. You're a part of that, even if you're "mixed" (I'm mixed too btw). I realize that's not what you want to hear, but it's the truth. It's not "racist" to acknowledge that.
You might be happier if you moved back to the Middle East, or if you moved to a country which has a bonafide history of diversity (e.g., Brazil). But the British people have called that island home for several millennia. They have a right to self-determination. If they reject your diversity one day, you really have no right to criticize them for it. You won't endear yourself by insulting them like Sadiq Khan has done.