How to be a sunny, healthy, confident and happy person?

Most of this idea still lies in my own idea. I used to be a person with low self-esteem and no self-confidence. The most important thing is that you should believe in yourself. A sunny, confident and lovely person is not what he looks like or how he studies, but a feeling that makes people feel comfortable from the heart. You can tell at a glance that this man is lively and sunny. Contact more positive people and read some positive literary works and fashion magazines. Wide range of knowledge. I am not stupid. Start (a disease)