Hahahahahah. NO. If you have a problem with these things, don't play the games. Very few games actually allow you to turn those sort of things off, because many developers don't want their games baby-ized for 12 year olds.
I don't think so. Jus wait patiently until you're old enough to play M rated games. Trust me, they aren't all they're cracked up to be. There are good games that aren't M rated like Sims 3, Forza, UFC 2010, Bully: Scholarship Edition and MLB/sports games.