Singing and speaking are actually the same mechanism. It is the minimum breath and the minimum tension that produces your natural and resonant voice. Tension is the enemy of the singer and I have spent 30 years working with singers, both training them to sing well and freeing their bodies of the tension that prevents their voice from flowing freely as it was designed.
My website has many articles and information that will help you begin to better understand what you vocal instrument is and how it functions naturally.
I have worked with singers from many countries via the internet to help them learn to produce a powerful and pleasant voice without ever straining or forcing. Our vocal instrument must always remain relaxed and without any impediment to its free flow or its power is diminished and it loses it ability to penetrate the heart of your audience.
If I can be assistance, please let me know.