No, you lied to the internet.
-Clears throat-
You gave false information to a company owned and operated by humans, who could get into a lawsuit for selling to underage people under false pretenses.
You lied to yourself. You essentially deceived your parents, who didn't know but trust you to be honest. You lied before God. You lied to Al Gore.
We all lie, especially to ourselves. It's great that you feel convicted and recognize what went on, because we often try to cover what we're doing. The popularity of the offense does not mean we do not do others or ourselves harm. In the Christian life, we see our offenses, repent, and move on with a clear conscience. Forgive yourself as God forgives you, and plan to make amends and new pathways.
Several years ago there were no ratings for games, so there is the aspect that the rule might not have been in place at one time or another. But the rule was created by consensus of people who felt it was dangerous for people of a certain age to view or participate in the games.
I would guess that by the time you were eleven or twelve, you felt like you could handle just about anything. You'd seen the evils of the world, the way people treat each other; and you were strong, capable, intelligent. At that time, you would have felt you could handle a game.
But people that young are still required to follow the instructions of authorities, and sometimes aren't inwardly strong or enough to know who is an authority and who is a danger, and how to walk away. Not an insult -- just a development tendency. What we put into our minds stays there, and influences how we think about the world. The brain sometimes confuses reality with dreams and movies and games-- especially the conclusions we draw from real and unreal experiences. (Gems are good and help you keep going, weapons are perks that give you power to battle opponents, police in games might be the bad guys. Monkeys can be good or bad.)
Games have a strong pull on people. They will justify all sorts of reasons for playing, and form complex rationales in their heads for why they're still doing it. I know students who dropped out of college because the games took over their lives and they stayed up every night, all night. Their conclusions and confessions, not mine.
I don't think there is a clear step you need to take right now -- it's more a matter of what you want to do before God. You are old, and developing your own ways to make decisions in life. Make a step that will help shape how you do things in the future.
