Ego and Mental Health: How to be happy again

We spend decades learning about knowledge and skills to become a player in the economic structure, to earn a living, yet we neglect the one most fundamental area - how to live. When we talk about how to live, we’re not just thinking about getting a job to support yourself, getting social recognition/approval or developing a certain lifestyle. How do we live in this physical world as an eternal being experiencing temporary human life? How do we handle thoughts and emotions? How do we live happily instead of suffering until death releases us?