The brain is like a dog and a dog has to be trained. To get a happy, well adjusted and confident dog who you can take anywhere, you do not need 10 000 hours of practice. An eight weeks course can show measurable results. Contrary to what is generally assumed, it is even possible to teach an old dog new tricks.
Obedience training is obviously important, dogs must know their place, but without a clear goal of what you want to achieve, you will probably not get any positive results, no matter how strict you are.
Study the educated, well adjusted, white middle class and learn from them. They know how to behave themselves. They have good table manners and they know how to arrange their facial muscles in the most appropriate way. They never complain on the global economic order. They thrive in this unjust world. They have learned to surf. This is the ideal you should aim for if you want happiness and success in your life.
The best way to learn about these things is to find a mindfulness coach and start practising. Reading cookbooks will not satisfy your hunger.