Well for me personally my emotional maturity grew as the years went on, and I basically grew out of it. Therapy helped a lot as well. Sometimes a trait will rear its ugly head, but it's not nearly as often as before.

I do think there is certainly some merit in the "fake it til you make it" mindset. To answer your question, trying to act healthy and do healthy activities is good for you. It helps me to see that there are positives about life and living.