Live ya life MBTIE-
You'll learn to appreciate that you can't assume that people are going to live to the same standard you are. So when you find out stuff about them that = failure in your book, it's not a let down.
You'll also be surprised at how much you as an ISTJ will do what you said you would never do. Not talking drug caliber offenses ( I have and always will think it's stupid to experiment with them), but you will begin to fall short of that standard that you hold yourself and others too, because you'll see it's unnecessary and gets in the way.