How do you know if you are drinking too much ... ?

If I put alcohol in my glass, I am guaranteed to be drinking too much.

One drink makes me feel happy and relaxed. Two drinks make me feels as though I am really enjoying my little party, and I lose enough of my inhibitions at the end of the second drink to decide that a third drink is a great idea...and possibly a fourth! If it goes that far, I am usually miserable for the next three days.