How do you avoid scrapping work you’ve already written?

Hello. I need some advice about creative writing. I am having trouble finishing short stories/collaborations because I constantly second guess what I write. Or, I go through life changes like moving, starting a new job, etc., and when I come back to the story, my mind set has flipped and I don’t want to finish it. I completely scrap everything. I know this is a bad habit and I need to kick it. What are your tips for pushing past this?