I can definitely relate a bit to this article, but I'd argue that you are in no way obligated to finish these projects and shouldn't have to feel guilt over them. Remember, they're side projects.

Also, I'd consider whether you really truly want to finish these projects, or if you moreso just want them to be finished. I've found that there's a big difference between wanting to work on something and wanting that thing to be finished, if that makes sense. In general, if it's not your main project, if you don't truly want to work on it, don't.