Instead of feeling like a failure, you might consider you are going about it in the wrong way. If you have a strong addiction to food, then you need to take that into consideration when you start your cleanse. You might try controlling your environment to make sure temptations are at a minimum. For example, when I started my cleanse I picked a time when I could be alone and not be around food and food smells. I took time off from work and isolated myself from temptations. That means no television because the food commercials are killer. If you have family, ask them to please respect your needs and maybe they will not cook aromatic foods for the first part of your fast. If you can't get them to do that, consider taking a vacation away from the bad influences. It's like being an alcoholic. The worst place for someone to go when they are sobering up is a bar or nightclub.
My strategy is to pick a time when I can be alone for a few days. I get rid of my food and have one last symbolic meal. I get rid of my old food especially since I'll start my new food diet when I come off the cleanse. I also stay home unless I need to go out for lemons... and to go for walks in the evening. I avoid people contact for the first 3 days and try to avoid toxic environments. If all else fails and you are craving food, try increasing the syrup by one TBLS and or take a therapeutic soak in a nice bath in candle light. Instead of dreading the process of the cleanse, look at it in a positive way. Look forward to your success and the well-being you will feel when it's over. In the right environment and with the right attitude, you will succeed.