Awwww Brenda
Buck up! Didn't we all find out that a positive attitude was a big key to getting this stuff off? Stop being so hard on yourself. Every change matters, no matter how little. So if you went from 1 to 1/2 a can a day it would make a difference.
You are very important, wonderful, and worthwhile person. I wish that you could see it as much as the rest of us do.
I noticed your comment about not making your labor day challenge, so what? I bet you did something else somewhere instead. I don't know if this would help you or not, but I took out the dates and challenges for me. If I want a challenge, I make sure it's something healthy like drinking my water for the day or getting x amount of miles in this week. This way I don't feel like I am in a race with every one else to meet goals. I don't feel like I failed if I didnt lose enough to get to my goal when other people did.
I didn't put my start date down again either so that I couldn't look at it and go, "wow, I have been on this WOE for 6mo and only lost x amount of weight while everyone else has been on it 3 months and lost the same!)
Think positive! It's not an easy thing to do. Sometimes you have to consciously (SP) make an effort to take every negative thought and find something positive about it. Then it starts to become a habit to think that way.
Sorry for the ramble, I know you didn't ask for all my opinions.