I found that I was too restrained since I was a child. How can we become more cheerful?

The world is interactive. If you give the world some love, the world will give you some love. If the world is a wall, the mentality is an echo wall. It responds in whatever tone it speaks with. All the troubles are due to asking too much of the outside world. If you love others, others will give you love; If you help others, others will help you. Plant happiness and reap happiness, plant resentment and reap pain. The loved one is back, and the blessed one is back.