I think the breaking point is when you have a choice. Often when I get depressed I just can't do somethings. I want to but it is just too much to handle. There has been some times when I didn't clean the house for a week or I let the grass get almost to my knees.

If there is something like trying to make a new friend but you don't put the effort in because dealing with people feels like sand paper then it more likely depression than laziness.