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in accordance to its genetic arrange of chemical reactions.

As I said, it's nature

I mean, the bacteria do not know they are surviving. At least it is just my guess.

I am not trying to prove that bacteria are sentient.

About how a self prevails I will adventure a hypothesis...

No need of a hypothesis. Stuka explained the DO in plain language, didn't he. It's just that, I don't think this is what the OP is looking for.

IMO (I could be wrong), OP is trying to understand why a basic survival instinct is there in any living thing. I just told him it's nature.