? I was minding my always-do business.
P.S. I mean I was doing that thing that I always do.
It is not natural. There is an idiomatic sentence: I was (just) minding my own business. It means I was not interfering in your affairs.
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It is not natural.
There is an idiomatic sentence:
I was (just) minding my own business.
It means I was not interfering in your affairs. / I was not paying any attention to you.