work for a feeling of achievement each day

This is the ultimate goal, is it not? I want this, but do not know how to achieve it. I go to my office job every day and feel like I can do better, come home, eat too much (sometimes) and feel guilty about it, go to the gym to work it off, maybe spend too much money to make me feel better, and then sit around and watch tv. Really, I think I could be great you know but I’m not doing a damn thing about it. I need some sort of motivation. Possibly a life altering trial from God . . . Any suggestions?