Yeah, I agree,
you are not an idiot, just an alcoholic. I would advise you to do STEP 1 again. It is the only step we have to do perfectly.
Don't play russian rullet with your life. I have a friend who is 23 years old and 3 months ago she did the same thing as you...got a liver test and it came back normal so she said "Yippee! I am fine. See, the alcohol is not hurting me. I can drink. Yadda Yadda Yadda.....and then, like you, she drank again!"
Well guess what?
She just found out she has hepatitis C and needs 48 weeks of chemo and she also has liver cirrosis! I KNOW SHE WISHES SHE WOULD NOT HAVE STARTED DRINKING AGAIN!