Because the anxiety that speaking in front of strangers can cause you may be leading you to be more introverted than you would like.
So ... If you manage to control the trembling of your leg, the sweat of your hands and the panic of imagining yourself in front of all those strangers, you will feel more sure of yourself and you will be able to decide if you want to stay in a corner. Now it will be your decision, not something inevitable because it scares you to think about talking to someone you do not know.
Of course, it will be essential to calm the mind with positive thoughts, practice repeatedly and be confident that everything will work out.
So take these tips to speak in front of many people as a pretext and apply them in the social situations that you live daily.