I don’t drink that much but I always seem to get black out drunk?

I wouldn’t say I drink that much - at the time I know what I am doing I am fully aware of my actions at the time but the day after, it’s like I can’t remember much? Is this because my memory is just bad or do I really get black out drunk? This confuses me because as I say, in the moment, I am fully aware of my actions.
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