I don't think opening Throne Room is correct. If Throne Room and Masquerade collide then, as for your opponent in the game, you're in a great situation. And Throne Room will be excellent later in the game with Wharf and the Peddlers. But I still think I'd open Masquerade/Silver, as the more likely situation is that Throne Room and Masquerade do not collide and they you're very sad if you can't get a Wharf.
You did make one big mistake: you resigned! You've trashed more and have more Throne Rooms, and you can't rule out your opponent having a run of bad luck (bad forced Masquerade passes, for instance). There are also a lot of points left on the board in a Colony game. Realistically you're still likely to lose, but playing from behind is a valuable skill and you should take the opportunity to practice it when you get the chance.
