discovering myself

I just realize that an average person spent 90% of one's life time by oneself. So the key to lead a happy life is to "Get along with yourself."
How?

The first thing I could think of would be to keep learning, so there is always some new to share with myself.
The 2nd thing is to get under the skin with oneself. Try to understand why I think and behave in a certain way. I guess that's related to psychology, neural science and personal health care.

With these two basics settled, I am pretty well rounded for the rest of my life.