I think pessimism is a professional deformation of programmers. We have to be pessimists in order to build good software. We have to think of the edge cases and

I think pessimism is a professional deformation of programmers. We have to be pessimists in order to build good software. We have to think of the edge cases and everything that might go wrong with the implementation. And this pessimism spills over to personal life. I'm not sure of the best way to fix this, as I'm working on it myself, but one of the things that helped is realizing that negative thinking comes from a voice in my head that interprets everything in a negative way. Just noticing and registering that negative voice has helped me be more positive.