MKB you are not alone I still suffer with the need to be right but I am learning, as Labug correctly stated above, Being right does not get me anywhere (or at least not in good relationships with people - friends, family, spouse)
Susan Page (Book - if we're so in love, why aren't we happy - that I dashed upstairs and pulled off a shelf when I read this thread) says "Being right is the booby prize of life, because you do get to be right, but that is all you get. You don't get to be closer to your partner. You don't get to allow your partner to feel closer to you".
And I so understand your "seems like I work on one area and then something else comes up" but don't look at it negatively - this is a journey of self discovery. With every new piece of understanding we are growing to be best people we can be. As your signature states "work in progress" and like you I am still learning about me; my behaviours and thoughts that trigger nasty voices/feelings and YOU are helping me do that. We are all growing and learning about our Selves together.
PS You are NOT a mess - none of us are - we just might need to tweak a few areas