Historically, my favorite whipping girl has been myself. When I was very young, I was such a perfectionist, I spent all my play time sorting and organizing my toys rather than enjoying them. In my relative youth, I callously labeled myself things like "failed student", "overeducated slacker", "frustrated perfectionist", and "defeated Type-A".
The more I said these nasty things to myself, the more I believed them, and -- self-fulfilling prophecy -- the more I failed.
And then I turned 40. No, seriously. I'm not gonna get too-too schmoopy and existential on you. Something actually changed in me right around my big 4-0.
Now, if I feel like a failure, frustrated, or defeated about some part of me, obviously I went wrong. I know that. So what? Forgive myself; nobody else is gonna do it. Quit dwelling on it; I potentially have less of my life ahead of me than behind, and living in the past isn't doing me any favors (and, sadly, we don't have hoverboards let alone time traveling DeLoreans to fix this crap properly). Learn from it; yay for learning. Next.
Forgive. Learn. Move on.
Respective of your original post... If there are facets of INTJ to which you aspire, and at which you feel you've (no baggage, this is just a word) failed, set them up and knock them out. Today is just as good as yesterday to start.
Unless you've got Doc Brown gettin' down on a flux capacitor build in the garage, of course.
No? Dang it!
-Sadie