Remove all the negative energy out of your system.
First of all, try to remove all your bad thinking about failure. Yes, you talk about the thoughts of being failed in this mission to get you in shape. Remove it and you will be fine. The thing about losing pounds is that, you may be able to gain or lose it again, but if you already remove the negative thoughts from your system, you may just keep forward and achieving whatever it is. For example, a person with negative thoughts will think that exercising might be good, but if he/she can’t do it, then he/she can’t do it. the truth is, he/she hasn’t try it. So, what’s the point of thinking negatively over and over again? While you actually can think or just try until you have succeed.