Dear Zen, you are NOT 'weak, stupid or judged' so please dismiss those thoughts as the inaccurate, self-defeatist words, such that the Beast would use to then offer a solution - drink.
You came here and recounted the drinking event, honestly and with the intention to never repeat it. Hold your head up high. eyes forwards and don't look backwards (the Beast will take the opportunity to look backwards, reminding you of this incident and suggesting you self-flagellate and as a cure, IT will offer a drink).
But, you are wise to the Beast's ways now. You pulled back after a couple of sips and didn't allow the Beast to take you into a vertigo mode. You reigned supreme, but were a little slow off the starting blocks in recognising the Beast - but when you did, you asserted your power over IT. You have nothing to admonish yourself for.
What is your plan for the future use of alcohol?