Drunk, blackout, embarrass myself?

Let me start by saying I don't drink daily, I don't crave drinking in anyway. I have children and did not drink through pregnacies and 8 months of breastfeeding with all 3..... BUT, when I do drink when I am out, it never fails that I embarrass myself and my friends/family and quite often blackout and don't remember what I did. I have been doing this more over the past few years as I did not blackout and act/talk crazy in the past. My question is what is my underlying issue that keeps me doing this when I feel so much guilt and embarrassment for days then it fades and history repeats itself
 
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