A famous conductor once said to me, "Build your cabinet with stability and it will last you a lifetime."
Likewise with singing. Technique is important but only one of the facets of skilled singing performers.
Singing can be a positive emotional and confidence boosting experience, one that is great for health and posture. I teach to get the very best out of each student and maintain their voices for a lifetime. There are techniques one can use to assist in building confidence, both onstage and off, and the "bel canto" style works well to enable the freedom of the voice and self.