I agree with the others that society defines success in a rigid way. I do have an education (Bachelors, Masters, and CPA) and had a really good management job that I worked hard to get but that does me no good right now. By society’s standards, I am no success. In light of my illness, I’ve had to revise my standards of success and my should statements (those should statements will make you absolutely miserable). When things were so touch and go for me...every day I woke up was a success. Maybe customize your own standards and don’t compare yourself to the should statements you currently hold.
The fact that you are working and going back to college to get your AA is huge. You are not a slacker. I also agree with the others about getting your depression treated if you aren’t already. Sending best wishes and big hugs.