Just as long as you don't delete the tracks you're working on, resilience will get you to finish them (and they'll be great). Sometimes, you just need a week or two away from a track to get any good work done on it. Nothing wrong with setting something aside for a while.
Another perspective to add to the other sensible things people have to say: keep making shit. Shitty is pretty.
Here are two tutorials, sent to me by a friend (on how to make dirty funk records). Friend said that he reads them when ever he thinks he is taking his music making too seriously.