The answer to all of these questions is the same. Change must come from within. You must WANT to change or you will not change. No quotation will help you if you do not want to change, and no quotation is needed if you really want to change. Losing weight comes from the will to stop eating and start exercising. This is a decision from within to just do it. In this case I will be specific. Consider low-carb diets such as Atkins or Sugar-Busters. Not zero carbs. Just reduce your carbs. Stopping OCD comes from the will to leave the compulsions behind and leave things alone. It is not that you can leave this behind and drop it. It is that you can drop it first and THEN leave it behind. Having worries and fears are normal. Just don't let them guide your life into inaction. ACTION is how you break the cycle. Take positive control of your life. By taking control, THAT is how you move forward. THAT is how you change to optimism. Here is the clue you need for this point: When you feel you have nothing good on your horizon, you are probably right because such feelings tend to become self-actualizing. I.e. self-fulfilling prophecies. Similarly, if you can look forward to good times, you can be positive. I will point out that some of your discussion resembles clinical depression, which can be treated in various ways. Seeing professional help if you can afford it might be what you need. Don't worry about lustful thoughts and acts. (I'm presuming some form of self-stimulation?) Just do other things to take your mind off those acts and thoughts. Take up a constructive hobby. Don't shoot for 60 days. You'll fall off the wagon in 60 days and end up right back where you started. To make a long-term change in your life you must consciously decide to make a permanent change. If you shoot for short-term change, you'll get one. All of it comes from recognizing that if you want it badly enough, you can do it. The strength from within depends on your level of desire for this change. God won't help you from the outside. If you believe in God, just remember that you have God within you. And that is where you will get help if you can get it anywhere. If you do not believe in God, then you must take active steps based on a true inner desire to change. If you don't really want to change, trust me. You won't. It must come from a true desire to change, no foolin' and no cheatin' at any time. Let's also distinguish between wanting to change and wishing to change. Wishing is looking outside of yourself. Wanting comes from within you. Don't make a wish. Make a decision based on a need. Then carry out the decision. Inaction is the killer of change. Fear to change kills desire to change. So don't think I disrespect the difficulty of changing. It takes true courage to leave the status quo behind in favor of a new way of living. Good luck!