All of the victory cards you went for - Duchy, Duke, Gardens - are those which WANT copper in your deck, and yet you opened moneylender/lookout.
You may want to get in the habit of, before making your first buy, envisioning at least roughly what your strategy is going to be; in this game, both the actions you bought were worse for you than Silver, IMO, and didn't fit in to what you were doing. You need to decide whether you want trashing at all before you decide to open with two trashers!