You're right. That's what a normal person would do. But that is the insanity of alcoholism. Our minds, especially in the beginning, tell us we can pull it off this time or it will be different. Play the tape all the way through and think of the consequences. You are looking at some real ones if you choose to drink.
As far as feeling depressed and down, I think you should give it some time. Just cause we are sober doesn't mean emotions go away. You are newly sober so don't be do hard on yourself and keep your expectations realistic. Expectations will lead to self seeking, resentments, feeling down...etc.