How to let go of your guard?

People have a sense of vigilance, that is, you have been hurt too much and suffered too much. In order to stop hurting yourself, you bind yourself tightly and don't want anyone to know your inner thoughts. That's because you have low self-esteem and no confidence in yourself, thinking that others will always hurt you. You live for yourself, and other people's opinions and ideas don't really matter. As long as you live happily, as long as you have done your best, whether you are successful or not.