It's not my business VS It's not concern of mine

[majid]

Hello dear teachers,

I wonder if there are any differences among the sentences.

-It's not my business.
-It has nothing to do with me.
-What's that to me?
-It's not concern of mine/my concern/It doesn’t concern me.
-It doesn't mind my business.

Thanks a milion.

[Mike Tyro]

Hello Majid, I'm new here.. I think they all say the same thing, but careful choice of the exact words would reveal more of the opinion and atitude of the speaker. It depends what you are trying to convey and the context you are using it in.

Who cares? So what? might suggest a more dismissive and cold attitude and say the same thing.