One of the first skills learned in a vocal lesson is how to control your breathing. Learn how to support the air properly. Experienced artists have control over the exhalation of air and they don’t allow themselves to use the throat at all in order to maintain the quality of sound.
In order to improve at something you need to practice. If singing is your passion, make sure you have ample opportunities to practice your skill and showcase your talent. Audition for every play or be a regular at your local Karaoke bar to get the experience of performing in front of people. When you know how to control your voice and you practice religiously the confidence gained from your improvement is an invaluable asset that will last a lifetime.