Well tbh I was like you before. I really wanted to finish all the quests, why is that? When me and a friend was questing its usually me that keep the lead on wich quests we should do and etc.
And I say: Ok lets do this one now. My friend says: Wtf? That quest is green, lets move on.
So I guess I have learned to abandon quests without feeling any remorse =). Now I abandon quests all the time. Im cured!