You have to maintain your sense of self. It feels like a natural ability to be self-aware, and perhaps it is. Maybe it can’t be taught. However, it can be practiced, and it can be exercised.
You know this because of the very practice you’re engaging in now—journaling is a way to observe yourself and keep yourself on the right track when you’ve fallen off. If you’re willing to see and critique yourself, you can improve next time.