Keeping it separate

I've never really liked mixing my group of friends. I'm quite particular about my work friends being separate from my school friends being separate from my outer school friends and so on. I've always been weird like that. I just like having my separate people and separate groups of friends. Just one of these weird things I do and like.

But recently, they've all seemed to be meshing together, and I've gotta say, I do not like it one bit. The only person that should be allowed to mingle with them all should be my best friend. But when that person start to mix my friends all together, I seriously start to feel anxiety and detest but I've never understood why.

I love all my friends, I do. I mean, I wouldn't have befriended them otherwise, right? It's not that they wouldn't get along if they were all together and it's not like I have anything to hide because I don't. But I just like to have some people s e g r e g a t e d from others. It may be due to the fact that they all know different things or because I feel different sorts of comfort with each of them?

I don't know if anyone will even understand this post or get where I'm coming from but I just don't like mixing groups of friends. And when it DOES happen, how do you stop it?