Help!

I need to loose half my body weight = 150lbs! I don't have big bones. I have no illness. Fat does not run in my family. I am fat because I eat too much and never exercise. I am 42 years old have been obese for twenty of those years. I love my family, hate myself. I can feel the fat clogging every inch of my being. I have a love for life, a wonderful husband and three beautiful children. I know that I am cheating myself out of living because of my relationship with food and this body. A body that I so despise and yet seem unable to let go of......how screwed up is that? I know what needs to be done - eat less exercise more - simple....why then do i find it so impossible?