Do you finish the pieces you don't like?

I've recently started as a full time painter and when I'm working on a piece and I see that the result doesn't convince me, it just gets put aside, there's always someone who says "wow, it's great, why don't you finish it?" But I can't, I try to take it up again to make the most of it thinking that there are people who like it but it's impossible, it bores me and doesn't inspire me (and I also have ADD) and I have to move on to something else. I guess it's something very common among artists, do any of you have a trick to make a piece motivate you again?