It was usually around the third drink that I realised I had started again, even though I had set out to not drink that day. Then there was no stopping me, complete loss of control, and I only stopped when I ran out of money, got too sick to continue, or got locked up.
I had a thing called (in AA) the phenomenon of craving, a sort of allergic reation to alcohol. Non alcoholics don't have that. The only way to avoid it is complete abstinence for life. There is no cure.
Like the others I suggest/strongly recommend that you stop now. No sense in risking all those negative consequences if you don't have to. How you get on following that very good advice will be very good information for the future.