How to do the impossible

I'm pissed and scared. My whole body hurts. It aches from one end to the other. Part stress part coming down with a case of fat. My body is holding my mind back and my mind is holding my body back. Why do I always have to have this stupid internal argument with myself?
I picked up some motrin today. It was on a BOGO sale. Yay. Fuck Fuck Fuck. I am so discouraged. I keep telling myself that I need to take baby steps and I can't expect to go right back to 90 min workouts 6 days a week. It will take time to get there so be patient and nice to myself. Then I just give up, get discouraged. How do I pull out of this?
I tried the buddy system as well as the group system. When I would fail I either felt ashamed or like I was letting someone down. The pressure was enormous. No more pressure for me now. How do I love myself enough to be kind and do what is right for me?