Allowing Actual Time to Write

I've been struggling to write for over 2 years now. That is, I've been struggling to finish anything. I think my problem lies in wanting to start over every new day I sit down to write. I'm guessing the solution to that is to go back to my blog post about writing a short story every time. I absolutely cannot come back to a manuscript in the middle of a scene. If that scene is incomplete I'll re-read it, decide it's shit, and delete the whole thing.

Therefore I really must finish what I start on a...