BAD LYING HABIT!! HELP!!?

i am 12 and i lie all the time. i lied to my mom about getting a myspace, i also told her i went to my friends house when in truth i went to a guys house. i also lie about grades, homework, and just about anything that pops into my head. i lie to get out of trouble, but all its done is get me into more. i am a christan, but i still lie. i really want to kick this habit. i hate it but it is like it controls my life. what should i do?