This might be a bit cogsci, but one thing that has really helped me over the years is to switch my mental language away from statements like "I never finish any

This might be a bit cogsci, but one thing that has really helped me over the years is to switch my mental language away from statements like "I never finish anything", to statements like "I have had trouble finishing things in the past." The first is a static judgment I am applying to myself, and it's a definitional straitjacket. The second is simply an observation, and it leaves room and opportunity for positive change. When we tell ourselves we "are" certain things or "always/never do" certain things, we are defining ourselves in a way that makes it harder to change, due to the reinforcement. At this point, I pretty much automatically recognize negative "judgments" and do the translation... I think it helps a lot.