Many people go through life with fragile self esteem that ebbs away easily at the slightest challenge and for others losing confidence and self esteem can be a crushing experience.
Increasing self esteem and confidence helps in all sorts of situations whether at work, making presentations, public speaking, standing up for yourself and generally feeling good.
When your self esteem is good, your communications improve and the feedback from others is more positive. This then feeds into yourself belief system, increasing your self-worth.
Using a combination of Hypnotherapy and powerful NLP techniques may help you.