Racially segregated friendship groups?

It seems like the majority of people I know stick to friendship groups with people of the same race. I just don't understand why. In my secondary school we had an Asian group and black group a white group a Turkish group and a "rebel" Asian group. Only the 'outcasts' seemed to mix. At sixth form it's the same with obviously some of these groups having one or two people from a different race but largely the same race. In my own friendship group we have English, Eastern European, East Asian, South Asian and African. We're a small friendship group as well and people seem to find it odd that we all hang around together. I think I've been able to experience a lot more by having such diverse friends.

I'd understand in places where there was a lack of ethnic minorities? It'd make sense but all my schools have been incredibly diverse? It seems pretty intentional to me too. If you're in a group like this why?

People generally like and prefer being near someone that is physically similar to them.

It's not like that in my school at all. Everyone's friendship groups are mixed apart from the asian girls who only hang around with other asian girls lol
Tbh I've only just realised that I'm the only black girl in my friendship group

Why? No problem with groups that just happen to be like that but when people intentionally do it. You say physically similar to them but you mean racially similar to them so say it. Why would you only want to be near someone of the same race?

jist to clarify, my friendship group is very multi cultural and i do not segregate myself from other races.

whether you agree or not, people would generally prefer their own race and feel better.

Very much segregated my college. In fact the location where it race ways is different. I suppose people just feel more comfortable around people of the same race.

All my schools have been 99.99% white lol