No you guys go at it all wrong have them tell you the changes they have seen in you. i doubt it has effected your life in any negitive way except for a little less cash but hell almost EVERYTHING cost money. tell them you can be responsible about it. If that is not your style what works for me is act like its not a big deal. The more you rebel the sooner it will be before you win the war. Im not saying break off froms your parents but when you leave don't tell them where your going and them when you come back just walk right up like its no big deal. I bet your parents drink, tell them you think they should stop drinking because its the same sort of thing. Hell just tell them your going to not do it in their house( you really not do that, it is there house) but when you leave the house do whatever you want.