Welcome to Fitday! I know what you mean about being heavy all your life. Lots of us are that way. Good for you for working towards a solution to that lifelong issue. 15lbs is a lot to lose in 6 weeks. But I know that you can do it. I just lost 27 in 8 weeks. It does take a lot of determination though. And after I was done with those 8 weeks, my mind & body took a little break on me and I didn't lose a pound for almost a month. Now I am losing again and am at almost 35 lbs in 3-1/2 months. It can be done, is what I am trying to say. But please be healthy about it. Doing it any other way is sure to backfire somehow.