"Blacking out" just means your memory is faded or obscured. Yes, you were likely INSANELY drunk, but it doesn't mean you were incapacitated. People are generally very aware of their actions at the time, and it doesn't mean anything in itself. The "blackout", or loss of memory, is the simple result of the blood alcohol level being high enough to hinder the normal neurological process of retaining memories.
As for worrying about being so absent-minded as to climb into your car and drive, the blackouts have nothing to do with this. That's just you being drunk and thinking you can drive. The fact you don't remember doing it has nothing to do with why it happened.
The lesson here is the same, whether you are a person who "blacks out" (has memory gaps) or not- if you drink, you give your keys to a sober/trustworthy friend. This way, you cannot just get into your car because you're too drunk to realize you shouldn't.
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