If you start now you will definately be sexy by the time your birthday comes around. Remember not to starve yourself. Your metabolism slows down in order for you to live. It feeds off your muscle and so any food you eat it will hold onto it and pack it on as fat, just in case you starve again. But if you keep giving your body nutritious food it won't hold onto it, and your metabolism will speed up and you will lose weight. Like I said before it is SOO important to drink lots of water! (Don't workout the same muscles 2 days in a row.) Good luck!